I’ve just seen this “notice” on one of the Windows devices after upgrading to v1.20.0. The remote device runs the official Android app v1.19.2 (which is still the newest release on F-Droid at the moment).
Below is a filtered log from the Windows device with all lines where the remote device “GCXVKIG” is being mentioned.
[QJFP3] 2022/05/03 19:11:05 INFO: Device GCXVKIG is "GCXVKIG" at [dynamic]
[QJFP3] 2022/05/03 19:11:06 INFO: Established secure connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:11:14 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:11:14 VERBOSE: Connected to device GCXVKIG at 10.0.0.57:22000 (type quic-server)
[QJFP3] 2022/05/03 19:11:33 VERBOSE: Completion for folder "fx37a-wmmxy" on device GCXVKIG is 0% (state: unknown)
[QJFP3] 2022/05/03 19:11:33 VERBOSE: Completion for folder "5eief-x9lna" on device GCXVKIG is 0% (state: unknown)
[QJFP3] 2022/05/03 19:14:06 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:14:06 INFO: Connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256 closed: writing message: Application error 0x0: closing
[QJFP3] 2022/05/03 19:14:06 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:14:07 VERBOSE: Completion for folder "mgieg-z3mzc" on device GCXVKIG is 0% (state: unknown)
[QJFP3] 2022/05/03 19:14:07 INFO: Established secure connection to GCXVKIG at 10.0.0.55:49767-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:07 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at 10.0.0.55:49767-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:07 VERBOSE: Connected to device GCXVKIG at 161.97.133.225:22067 (type relay-client)
[QJFP3] 2022/05/03 19:14:07 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:14:07 INFO: Failed to exchange Hello messages with GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256: Application error 0x0: closing
[QJFP3] 2022/05/03 19:14:07 INFO: Failed to exchange Hello messages with GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256: Application error 0x0: closing
[QJFP3] 2022/05/03 19:14:08 WARNING: Connecting to GCXVKIG (10.0.0.56:22000): the remote device speaks an unknown (newer?) version of the protocol
[QJFP3] 2022/05/03 19:14:11 INFO: Connection to GCXVKIG at 10.0.0.55:49767-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256 closed: writing message: write tcp 10.0.0.55:49767->161.97.133.225:22067: wsasend: An existing connection was forcibly closed by the remote host.
[QJFP3] 2022/05/03 19:14:11 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:14:12 INFO: Established secure connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:14:12 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:14:12 VERBOSE: Connected to device GCXVKIG at 10.0.0.57:22000 (type quic-server)
[QJFP3] 2022/05/03 19:14:12 INFO: Connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256 closed: reading length: Application error 0x0: closing
[QJFP3] 2022/05/03 19:14:12 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:14:15 INFO: Established secure connection to GCXVKIG at 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:15 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:15 VERBOSE: Connected to device GCXVKIG at 10.0.0.57:22000 (type tcp-server)
[QJFP3] 2022/05/03 19:14:15 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:14:15 INFO: Connection to GCXVKIG at 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256 closed: writing message: use of closed network connection
[QJFP3] 2022/05/03 19:14:15 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:14:23 INFO: Established secure connection to GCXVKIG at 10.0.0.55:50143-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:23 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at 10.0.0.55:50143-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:14:23 VERBOSE: Connected to device GCXVKIG at 161.97.133.225:22067 (type relay-client)
[QJFP3] 2022/05/03 19:14:23 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:14:24 VERBOSE: Device GCXVKIG sent an index update for "5eief-x9lna" with 25 items
[QJFP3] 2022/05/03 19:14:24 VERBOSE: Device GCXVKIG sent an index update for "w9h6p-vpccd" with 7 items
[QJFP3] 2022/05/03 19:14:28 VERBOSE: Device GCXVKIG sent an index update for "mgieg-z3mzc" with 25 items
[QJFP3] 2022/05/03 19:14:30 INFO: Established secure connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:14:30 INFO: Replacing old connection 10.0.0.55:50143-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256 with [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256 for GCXVKIG
[QJFP3] 2022/05/03 19:14:32 INFO: Connection to GCXVKIG at 10.0.0.55:50143-161.97.133.225:22067/relay-client/TLS1.3-TLS_AES_128_GCM_SHA256 closed: replacing connection
[QJFP3] 2022/05/03 19:14:32 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 1000 items
[QJFP3] 2022/05/03 19:14:32 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256
[QJFP3] 2022/05/03 19:14:32 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:14:32 VERBOSE: Connected to device GCXVKIG at 10.0.0.57:22000 (type quic-server)
[QJFP3] 2022/05/03 19:14:33 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:14:35 INFO: Connection from GCXVKIG at 161.97.133.225:22067 (relay-client) rejected: already connected to this device
[QJFP3] 2022/05/03 19:14:38 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 1000 items
[QJFP3] 2022/05/03 19:15:13 INFO: Established secure connection to GCXVKIG at 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:15:13 INFO: Replacing old connection [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256 with 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256 for GCXVKIG
[QJFP3] 2022/05/03 19:15:14 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:14 INFO: Connection to GCXVKIG at [::]:22000-10.0.0.57:22000/quic-server/TLS1.3-TLS_CHACHA20_POLY1305_SHA256 closed: replacing connection
[QJFP3] 2022/05/03 19:15:14 INFO: Device GCXVKIG client is "syncthing v1.19.2" named "GCXVKIG" at 10.0.0.55:22000-10.0.0.57:22000/tcp-server/TLS1.3-TLS_AES_128_GCM_SHA256
[QJFP3] 2022/05/03 19:15:14 VERBOSE: Disconnected from device GCXVKIG
[QJFP3] 2022/05/03 19:15:14 VERBOSE: Connected to device GCXVKIG at 10.0.0.57:22000 (type tcp-server)
[QJFP3] 2022/05/03 19:15:14 VERBOSE: Received ClusterConfig from device GCXVKIG
[QJFP3] 2022/05/03 19:15:16 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:50 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 1000 items
[QJFP3] 2022/05/03 19:15:51 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:52 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:53 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 1000 items
[QJFP3] 2022/05/03 19:15:55 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:56 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 1000 items
[QJFP3] 2022/05/03 19:15:57 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:15:58 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 627 items
[QJFP3] 2022/05/03 19:15:59 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:16:00 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:16:01 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:16:02 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 860 items
[QJFP3] 2022/05/03 19:16:03 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:16:04 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 1000 items
[QJFP3] 2022/05/03 19:16:04 VERBOSE: Device GCXVKIG sent an index update for "fx37a-wmmxy" with 12 items
[QJFP3] 2022/05/03 19:16:04 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 31 items
[QJFP3] 2022/05/03 19:16:04 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 44 items
[QJFP3] 2022/05/03 19:16:13 VERBOSE: Completion for folder "j2kgm-h9kws" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:16:25 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 18 items
[QJFP3] 2022/05/03 19:16:26 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 3 items
[QJFP3] 2022/05/03 19:16:28 VERBOSE: Completion for folder "j2kgm-h9kws" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:16:35 VERBOSE: Device GCXVKIG sent an index update for "j2kgm-h9kws" with 59 items
[QJFP3] 2022/05/03 19:16:37 VERBOSE: Completion for folder "j2kgm-h9kws" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:19:53 VERBOSE: Completion for folder "mgieg-z3mzc" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:19:53 VERBOSE: Completion for folder "w9h6p-vpccd" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:19:53 VERBOSE: Completion for folder "5eief-x9lna" on device GCXVKIG is 100% (state: valid)
[QJFP3] 2022/05/03 19:19:53 VERBOSE: Completion for folder "fx37a-wmmxy" on device GCXVKIG is 100% (state: valid)
Have you got any idea what the problem may be about here? I can provide full verbose and audit (but not debug, unfortunately) logs from the Windows side and the basic log from the Android side if necessary.
Edit I’ve just noticed something weird here. The notice mentions “GCXVKIG (10.0.0.56:22000)”, but the actual address of GCXVKIG is “10.0.0.57”, while “10.0.0.56” belongs to a different Windows device. All remote devices have their addresses set to dynamic
.