Syncthing is stuck

Aquatica · February 19, 2026, 9:48am

I’ve recently switched phones from my old Pixel 8 to an Oppo (relevant because you’ll probably see the old device name in the logs) and exported/imported the configuration.

This is where I noticed syncthing was stuck at 99% with my server on one specific file. I tried to restart both parties, but it didn’t help, so I moved the file hoping it would wake things up. It did not.

As a next step, I removed the device from my server and re-added it, but this caused syncthing to want to resync ALL files even though they are already present. Now syncthing is stuck at 0% but newer files still get synced. I also tried re-adding the server on my phone, but things don’t change.

The exact same is happening with my computer who cannot sync with my phone and is completely stuck.

Logs are attached but I don’t see anything helpful

Phone Logs:

2026-02-19 10:37:09 INF syncthing v2.0.14 “Hafnium Hornet” (go1.25.6 android-arm64) reproducible-build@researchxxl-syncthing-android 2026-02-02 04:32:24 UTC [Syncthing-Fork, noupgrade, stnoupgrade] (log.pkg=main) 2026-02-19 10:37:09 INF Calculated our device ID (device=EIEAA7G-5SMCHLD-EIEFVB5-PF7YUDE-RD373OH-VVKBLBF-ALBMIWB-VTMZWQP log.pkg=syncthing) 2026-02-19 10:37:09 INF Overall rate limit in use (send=“is unlimited” recv=“is unlimited” log.pkg=connections) 2026-02-19 10:37:09 INF Using discovery mechanism (identity=“global discovery server ``https://discovery-lookup.syncthing.net/v2/?noannounce``” log.pkg=discover) 2026-02-19 10:37:09 INF Relay listener starting (id=dynamic+https://relays.syncthing.net/endpoint log.pkg=connections) 2026-02-19 10:37:09 INF QUIC listener starting (address=“[::]:22000” log.pkg=connections) 2026-02-19 10:37:09 INF TCP listener starting (address=“[::]:22000” log.pkg=connections) 2026-02-19 10:37:09 INF GUI and API listening (address=127.0.0.1:8384 log.pkg=api) 2026-02-19 10:37:09 INF Ready to synchronize (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:09 INF Using discovery mechanism (identity=“global discovery server ``https://discovery-announce-v4.syncthing.net/v2/?nolookup``” log.pkg=discover) 2026-02-19 10:37:09 INF Using discovery mechanism (identity=“global discovery server ``https://discovery-announce-v6.syncthing.net/v2/?nolookup``” log.pkg=discover) 2026-02-19 10:37:09 INF Using discovery mechanism (identity=“IPv4 local broadcast discovery on port 21027” log.pkg=discover) 2026-02-19 10:37:09 INF Using discovery mechanism (identity=“IPv6 local multicast discovery on address [ff12::8384]:21027” log.pkg=discover) 2026-02-19 10:37:09 INF Access the GUI via the following URL: ``https://127.0.0.1:8384/`` (log.pkg=api) 2026-02-19 10:37:09 INF Loaded configuration (name=“Pixel 8” log.pkg=syncthing) 2026-02-19 10:37:09 INF Loaded peer device configuration (device=53RYXIM name=syncthing_home_server address=“[dynamic]” log.pkg=syncthing) 2026-02-19 10:37:09 INF Loaded peer device configuration (device=EFGIO2R name=home-fedora-desktop address=“[dynamic]” log.pkg=syncthing) 2026-02-19 10:37:09 INF Loaded peer device configuration (device=E4CTVUZ name=laptop-fedora address=“[dynamic]” log.pkg=syncthing) 2026-02-19 10:37:09 INF Loaded peer device configuration (device=JK2PUXJ name=fedora-framework address=“[dynamic]” log.pkg=syncthing) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Established secure connection (device=EFGIO2R connection.local=“[fd2f:8c40:d12e:0:b0fb:28ff:fe9d:8862]:22000” connection.remote=“[fd2f:8c40:d12e:0:3cd4:180:3c2a:e6bf]:22000” connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH0BQ4JEQOK9URQS1A9PCEA log.pkg=connections) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF New device connection (device=EFGIO2R address=“[fd2f:8c40:d12e:0:3cd4:180:3c2a:e6bf]:22000” remote.name=home-fedora-desktop remote.client=syncthing remote.version=v2.0.14 log.pkg=model) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=“[fd2f:8c40:d12e:0:3cd4:180:3c2a:e6bf]:22000” error=EOF log.pkg=connections) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=10.0.0.71:22000 error=EOF log.pkg=connections) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=“[fe80::879a:e636:826f:b9ff%wlan0]:22000” error=“write tcp [fe80::b0fb:28ff:fe9d:8862%wlan0]:22000->[fe80::879a:e636:826f:b9ff%wlan0]:22000: write: connection reset by peer” log.pkg=connections) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Established secure connection (device=EFGIO2R connection.local=“[fe80::b0fb:28ff:fe9d:8862%wlan0]:22000” connection.remote=“[fe80::879a:e636:826f:b9ff%wlan0]:46958” connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH0BTBT1G4FKA8G2PS995VS log.pkg=connections) 2026-02-19 10:37:10 INF Additional device connection (device=EFGIO2R address=“[fe80::879a:e636:826f:b9ff%wlan0]:46958” count=1 log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=“[fd2f:8c40:d12e:0:3cd4:180:3c2a:e6bf]:41822” error=EOF log.pkg=connections) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=“[fd2f:8c40:d12e:0:3cd4:180:3c2a:e6bf]:55224” error=EOF log.pkg=connections) 2026-02-19 10:37:10 WRN Failed to exchange Hello messages (device=EFGIO2R address=10.0.0.71:57550 error=“write tcp 10.0.0.230:22000->10.0.0.71:57550: write: connection reset by peer” log.pkg=connections) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Measured hashing performance (perf=“1428.53 MB/s” log.pkg=syncthing) 2026-02-19 10:37:10 INF Established secure connection (device=53RYXIM connection.local=10.0.0.230:22000 connection.remote=151.59.0.98:22000 connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=64LJH0DJS80LUJ62N5M2J39HII log.pkg=connections) 2026-02-19 10:37:10 INF New device connection (device=53RYXIM address=151.59.0.98:22000 remote.name=syncthing_home_server remote.client=syncthing remote.version=v2.0.14 log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Ready to synchronize (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Restarted folder (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:10 INF Completed initial scan (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:14 INF Completed initial scan (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=Books folder.id=qsibh-pcsro folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Ready to synchronize (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Restarted folder (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=Tools folder.id=ht7md-fddzd folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=File-Sharing folder.id=nicxz-oyv7a folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=“Banking Docs” folder.id=dsywg-bkbca folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=Exports folder.id=jb2zf-tcjq3 folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:20 INF Established secure connection (device=EFGIO2R connection.local=10.0.0.230:56886 connection.remote=10.0.0.71:22000 connection.type=tcp-client connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH1IR3BMJI5T2NQ5GTB515O log.pkg=connections) 2026-02-19 10:37:20 INF Additional device connection (device=EFGIO2R address=10.0.0.71:22000 count=2 log.pkg=model) 2026-02-19 10:37:20 INF Completed initial scan (folder.label=Music folder.id=ntfas-hk9ma folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:22 INF Completed initial scan (folder.label=DCIM folder.id=twvoj-3mzin folder.type=sendreceive log.pkg=model) 2026-02-19 10:37:24 INF Established secure connection (device=53RYXIM connection.local=10.0.0.230:22000 connection.remote=10.0.0.21:22000 connection.type=quic-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=20 connection.id=64LJH22SC624OPP87SI4SLJPTO log.pkg=connections) 2026-02-19 10:37:24 INF Additional device connection (device=53RYXIM address=10.0.0.21:22000 count=1 log.pkg=model) 2026-02-19 10:37:24 INF Lost device connection (kind=primary device=53RYXIM connection=10.0.0.230:22000-151.59.0.98:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJH0DJS80LUJ62N5M2J39HII error=“replacing connection” remaining=1 log.pkg=model) 2026-02-19 10:37:24 INF Established secure connection (device=53RYXIM connection.local=10.0.0.230:22000 connection.remote=10.0.0.21:22000 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH232ED7SUO0SMJCFG901DM log.pkg=connections) 2026-02-19 10:37:24 INF Additional device connection (device=53RYXIM address=10.0.0.21:22000 count=1 log.pkg=model) 2026-02-19 10:37:24 INF Established secure connection (device=53RYXIM connection.local=10.0.0.230:22000 connection.remote=10.0.0.21:39110 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH236PH82011HH5EE2H3G9A log.pkg=connections) 2026-02-19 10:37:24 INF Additional device connection (device=53RYXIM address=10.0.0.21:39110 count=2 log.pkg=model) 2026-02-19 10:37:25 INF Lost device connection (kind=primary device=53RYXIM connection=10.0.0.230:22000-10.0.0.21:22000/quic-server/TLS1.3-TLS_AES_128_GCM_SHA256/LAN-P20-64LJH22SC624OPP87SI4SLJPTO error=“replacing connection” remaining=2 log.pkg=model) 2026-02-19 10:37:25 INF Joined relay (uri=relay://185.211.103.96:443 log.pkg=relay/client) 2026-02-19 10:37:25 INF Established secure connection (device=53RYXIM connection.local=10.0.0.230:22000 connection.remote=10.0.0.21:54098 connection.type=tcp-server connection.lan=true connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=10 connection.id=64LJH276EG6IGP4EKPT4QGT22C log.pkg=connections) 2026-02-19 10:37:25 INF Additional device connection (device=53RYXIM address=10.0.0.21:54098 count=2 log.pkg=model) 2026-02-19 10:37:30 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP ``id=NAT-PMP@10.0.0.1`` error=“getting new lease on ``NAT-PMP@10.0.0.1`` (external port 59129 → internal port 22000): unexpected result size 12, expected 16” log.pkg=nat) 2026-02-19 10:37:30 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP id=“75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2``” error=“getting new lease on 75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2`` (external port 45600 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat) 2026-02-19 10:37:30 INF Detected NAT type (uri=quic://0.0.0.0:22000 type=“Port restricted NAT” log.pkg=connections) 2026-02-19 10:37:30 INF Resolved external address (uri=quic://0.0.0.0:22000 address=quic://151.59.0.98:57038 ``via:3478=stun.voip.aebc.com`` log.pkg=connections) 2026-02-19 10:37:31 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP id=“75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1``” error=“getting new lease on 75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1`` (external port 24169 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat) 2026-02-19 10:37:31 INF Detected NAT services (count=3 log.pkg=nat) 2026-02-19 10:37:56 WRN Failed to acquire open port (mapping=“[::]:22000/TCP” ``id=NAT-PMP@10.0.0.1`` error=“getting new lease on ``NAT-PMP@10.0.0.1`` (external port 59129 → internal port 22000): unexpected result size 12, expected 16” log.pkg=nat) 2026-02-19 10:37:56 WRN Failed to acquire open port (mapping=“[::]:22000/TCP” id=“75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2``” error=“getting new lease on 75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2`` (external port 45600 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat) 2026-02-19 10:37:57 WRN Failed to acquire open port (mapping=“[::]:22000/TCP” id=“75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1``” error=“getting new lease on 75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1`` (external port 24169 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat) 2026-02-19 10:37:57 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP ``id=NAT-PMP@10.0.0.1`` error=“getting new lease on ``NAT-PMP@10.0.0.1`` (external port 59129 → internal port 22000): unexpected result size 12, expected 16” log.pkg=nat) 2026-02-19 10:37:57 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP id=“75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2``” error=“getting new lease on 75802409-bccb-40e7-9f6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn2/urn:schemas-upnp-org:service:WANIPConnection:2/``http://10.0.0.1:49000/igd2upnp/control/WANIPConn2`` (external port 45600 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat) 2026-02-19 10:37:57 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP id=“75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1``” error=“getting new lease on 75802409-bccb-40e7-8e6c-3C3712E6D90B/WANDevice - spacetunnel/urn:upnp-org:serviceId:WANIPConn1/urn:schemas-upnp-org:service:WANIPConnection:1/``http://10.0.0.1:49000/igdupnp/control/WANIPConn1`` (external port 24169 → internal port 22000): UPnP Error: Not available Action (403)” log.pkg=nat)

Server logs:

2026-02-19 09:37:10 INF Lost device connection (kind=secondary device=EIEAA7G connection=172.26.0.2:54624-10.0.0.230:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJD7SHJNQG8RDA5C8VJ19NM6 error=“reading length: read tcp 172.26.0.2:54624->10.0.0.230:22000: read: connection reset by peer” remaining=1 log.pkg=model) 2026-02-19 09:37:10 INF Lost device connection (kind=secondary device=EIEAA7G connection=172.26.0.2:54622-10.0.0.230:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJD78NIPTJ49NIVQQLVGAAC6 error=“reading length: read tcp 172.26.0.2:54622->10.0.0.230:22000: read: connection reset by peer” remaining=0 log.pkg=model) 2026-02-19 09:37:10 INF Connection closed (device=EIEAA7G connection=172.26.0.2:54622-10.0.0.230:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJD78NIPTJ49NIVQQLVGAAC6 error=“reading length: read tcp 172.26.0.2:54622->10.0.0.230:22000: read: connection reset by peer” log.pkg=model) 2026-02-19 09:37:10 INF Lost device connection (kind=primary device=EIEAA7G connection=172.26.0.2:22000-10.0.0.230:22000/tcp-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJD6LR4H5NQGCP6FOS871NTA error=“reading length: read tcp 172.26.0.2:22000->10.0.0.230:22000: read: connection reset by peer” remaining=2 log.pkg=model) 2026-02-19 09:37:11 INF Established secure connection (device=EIEAA7G connection.local=172.26.0.2:22000 connection.remote=151.59.0.98:62795 connection.type=tcp-server connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=64LJH0DJS80LUAPETIED855H6U log.pkg=connections) 2026-02-19 09:37:11 INF New device connection (device=EIEAA7G address=151.59.0.98:62795 remote.name=“Pixel 8” remote.client=syncthing remote.version=v2.0.14 log.pkg=model) 2026-02-19 09:37:25 INF Established secure connection (device=EIEAA7G connection.local=“[::]:22000” connection.remote=10.0.0.230:22000 connection.type=quic-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=40 connection.id=64LJH22SC624O9O2F5NQJSP2L6 log.pkg=connections) 2026-02-19 09:37:25 INF Additional device connection (device=EIEAA7G address=10.0.0.230:22000 count=1 log.pkg=model) 2026-02-19 09:37:25 INF Lost device connection (kind=primary device=EIEAA7G connection=172.26.0.2:22000-151.59.0.98:62795/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P30-64LJH0DJS80LUAPETIED855H6U error=“reading length: read tcp 172.26.0.2:22000->151.59.0.98:62795: read: connection reset by peer” remaining=1 log.pkg=model) 2026-02-19 09:37:25 INF Established secure connection (device=EIEAA7G connection.local=172.26.0.2:22000 connection.remote=10.0.0.230:22000 connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=64LJH232ED7SUU0FSTCN54H5DK log.pkg=connections) 2026-02-19 09:37:25 INF Additional device connection (device=EIEAA7G address=10.0.0.230:22000 count=1 log.pkg=model) 2026-02-19 09:37:25 WRN Failed TLS handshake (address=172.26.0.254:40712 error=EOF log.pkg=connections) 2026-02-19 09:37:25 INF Established secure connection (device=EIEAA7G connection.local=172.26.0.2:39110 connection.remote=10.0.0.230:22000 connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=64LJH236PH820RVULLQMRK2VIM log.pkg=connections) 2026-02-19 09:37:25 INF Additional device connection (device=EIEAA7G address=10.0.0.230:22000 count=2 log.pkg=model) 2026-02-19 09:37:26 INF Lost device connection (kind=primary device=EIEAA7G connection=“[::]:22000-10.0.0.230:22000/quic-client/TLS1.3-TLS_AES_128_GCM_SHA256/WAN-P40-64LJH22SC624O9O2F5NQJSP2L6” error=“reading length: Application error 0x0 (remote): closing” remaining=2 log.pkg=model) 2026-02-19 09:37:26 WRN Failed TLS handshake (address=172.26.0.254:43704 error=EOF log.pkg=connections) 2026-02-19 09:37:26 INF Established secure connection (device=EIEAA7G connection.local=172.26.0.2:54098 connection.remote=10.0.0.230:22000 connection.type=tcp-client connection.lan=false connection.crypto=TLS1.3-TLS_AES_128_GCM_SHA256 connection.prio=30 connection.id=64LJH276EG6IGGDCN58089FC42 log.pkg=connections) 2026-02-19 09:37:26 INF Additional device connection (device=EIEAA7G address=10.0.0.230:22000 count=2 log.pkg=model)

marbens · February 21, 2026, 9:56pm

Potentially relevant:

github.com/syncthing/syncthing

Index IDs persist after unsharing folder

opened 04:16PM - 22 Nov 25 UTC

marbens-arch

bug

### What happened? Steps to reproduce: 1. Create a fakefs folder with path `te…st?files=20` on device A 2. Create a fakefs folder with the same ID and with path `test?content=true` on device B 3. Share the fakefs folder with device B 4. Wait for device B to get in sync 5. On device A, unshare the folder with device B 6. Reshare the folder with device B Expected behavior: Device B shows as up to date on device A, as device B already has all the files it needs. Actual behavior: Device B's status is "syncing" endlessly (or until you restart device A with `--debug-reset-delta-idxs`) on device A. <img width="563" height="498" alt="Image" src="https://github.com/user-attachments/assets/198589c2-fb48-487c-b6f7-41c9ed6828ea" /> ### Syncthing version v2.0.11 ### Platform & operating system Linux amd64 ### Browser version _No response_ ### Relevant log output ```shell 2025-11-22 07:59:08 DBG model@0xc0000fa000 Completion(BPFTEVI-CGXXZQL-FFK2XVO-VJ6JNXX-34RIM77-MXMQNV3-EIMMGM4-YE5QSQZ, "test"): map[completion:0 globalBytes:22767766 globalItems:59 needBytes:22767766 needDeletes:0 needItems:59 remoteState:valid sequence:118] (log.pkg=model log.src.file=model.go log.src.line=947) 2025-11-22 07:59:08 DBG model@0xc0000fa000 Completion(BPFTEVI-CGXXZQL-FFK2XVO-VJ6JNXX-34RIM77-MXMQNV3-EIMMGM4-YE5QSQZ, "test"): map[completion:0 globalBytes:22767766 globalItems:59 needBytes:22767766 needDeletes:0 needItems:59 remoteState:valid sequence:118] (log.pkg=model log.src.file=model.go log.src.line=947) 2025-11-22 07:59:09 DBG model@0xc0000fa000 Completion(BPFTEVI-CGXXZQL-FFK2XVO-VJ6JNXX-34RIM77-MXMQNV3-EIMMGM4-YE5QSQZ, "test"): map[completion:0 globalBytes:22767766 globalItems:59 needBytes:22767766 needDeletes:0 needItems:59 remoteState:valid sequence:118] (log.pkg=model log.src.file=model.go log.src.line=947) ```

As a workaround, you can reset your delta indexes by starting Syncthing with the --debug-reset-delta-idxs option.

Aquatica · February 22, 2026, 11:05am

Thank you! I just tried this between my server and my computer, they started syncing files, but then they became stuck like this:

UPDATE: I have reconnected all nodes and they’re all stuck at 99% now

Aquatica · February 22, 2026, 12:08pm

@marbens Here’s the current state of things now: My laptop:

My server:

My computer:

My phone:

acolomb · February 22, 2026, 9:16pm

Those “out of sync items” could be caused by some files that cannot be synced. Most likely because they have characters in the file name which the platform does not allow. Check out the list of items by click on the counts. See what the GUI on the other side (the specific remote device) has to say about the shared folders and possibly any “failed items”.

Aquatica · February 23, 2026, 9:35am

There are no failed items, only “Out of sync” ones with no explanation attached, it’s as if they are waiting.

I did notice that the files that are not syncing are in two encrypted folders. I see no errors, but the files are the same (and not all of them in the folder) in all the clients.

Aquatica · February 23, 2026, 12:15pm

Could this be related: Encrypted peer needs files but actually already has them · Issue #9884 · syncthing/syncthing · GitHub?

acolomb · February 23, 2026, 10:02pm

No failed items on the remote device panel? Or on the folder panel when looking at the matching remote device’s GUI instead?

Aquatica · February 24, 2026, 10:10am

In any case, no failed items tab.

tomasz86 · February 24, 2026, 10:44am

Please post full screenshots of the web GUI from all sides. Make also sure to unfold the affected folders information.

Aquatica · February 24, 2026, 11:07am

These are the screenshots from my server:

These are the screenshots from my computer:

These are the screenshots from my phone:

tomasz86 · February 24, 2026, 11:43am

Thanks for the screenshots, they definitely help grasp the situation better. Something does look wrong with no valid reason so far. What I’d do in order to try troubleshooting this is:

Focus on just two devices first (e.g. the server and the desktop), and on them, pause all other remote devices.
Isolate the problematic folder(s) by pausing all other folders.
Remove the folder on one side (just from Syncthing first), then add it again. You can trigger the Add Folder pop-up by pausing and unpausing the remote device.
If that doesn’t change anything, try to repeat the process but this time remove the actual files from the disk as well.
If the problem persists, repeat the procedure on the other side too.

If all of the above haven’t helped, then at this stage, I think you will have to wipe the Syncthing’s database and start from scratch (starting from one device, then moving to the next if the issue persists). Are these installations fresh or rather older that have been upgraded to Syncthing v2?

Also, before experimenting with anything, please make sure that you’ve got proper backups of all your important data.

Aquatica · February 24, 2026, 11:58am

Ok, it looks like it’s syncing anyway, let’s see…

tomasz86 · February 24, 2026, 12:03pm

Great to hear that, just one comment, as I don’t really use Receive Encrypted folders and forgot to mention this. With this folder type specifically, you do need to remove both the folder from Syncthing also the files from the disk, i.e. you cannot reuse the existing ones, they have to be downloaded all from scratch.

Aquatica · February 24, 2026, 12:05pm

Okay good to know, I will stop it from syncing, delete it from both disk and UI and see what happens. I will update you as soon as it is done, it’s a lot of GBs

Aquatica · February 24, 2026, 12:30pm

Thank you so much! You fixed it!

They are old installations later migrated to v2. It was already happening in v1.

tomasz86 · February 24, 2026, 2:29pm

Great to know that the issue is gone . I was asking about the installation age, as there may be some old database-related bugs coming from v1 that might have possibly still lingered after the upgrade, but if there’re no other problems with the synchronisation, I’d just continue using it without doing a full reset.

johnnydecimal · February 26, 2026, 10:49am

FYI I have this exact issue after upgrading to v2.0.14 yesterday. I’ll do the remove/re-add trick which looks like it’ll resolve it.

Here’s curium’s view of neon:

And here’s neon, just as happy as can be. Folder d25 is the one with stuck items.

Confirmed

That fixes it.

Aquatica · March 12, 2026, 3:56pm

The issue re-appeared for me, can you confirm if the fix is still working for you?

johnnydecimal · March 13, 2026, 12:42am

All good here.