Synthing gui only runs from remote host using ssh

Support
1

I have a remote host using Ubuntu Server 20.04 running Syncthing. For some reason, I can only access the Syncthing gui remotely through an ssh binding using ssh -L 9090:127.0.0.1:8384 user@remote_host_ip

I cannot get the gui using remote_host_ip:8384

This the case whether my ufw firewall is up or down (locally, remotely, and both), but I have rules set on the remote machine to allow port 8384 using the syncthing-gui profile, as well as the port forwarded on my local router. The syncthing server works, as I’ve already synced a folder, but I don’t want to have to use a ssh binding every time I want to graphically administer the server.

Some test results:

run on remote host

netstat -npl | grep 8384

returns:

tcp6 0 0 :::8384 :::* LISTEN 63517/syncthing

run on local host:

nping -g 8384 remote_host_ip

returns:

    SENT (3.0088s) Starting TCP Handshake > remote_host_ip:80
    RCVD (3.0437s) Handshake with remote_host_ip completed
    libnsock mksock_bind_addr(): Bind to 0.0.0.0:8384 failed (IOD #5): Address already in use (98)
    Max rtt: 37.149ms | Min rtt: 34.916ms | Avg rtt: 35.803ms
    TCP connection attempts: 5 | Successful connections: 5 | Failed: 0 (0.00%)
    Nping done: 1 IP address pinged in 4.05 seconds

This is a process list filtered for syncthing run on the remote host:

user        63500  0.0  0.8 120560  4992 ?        Ssl  23:08   0:00 /usr/bin/syncthing -no-browser -no-restart -logflags=0
user        63517  0.2  5.5 122800 32668 ?        SNl  23:08   0:04 /usr/bin/syncthing -no-browser -no-restart -logflags=0

Thanks in advance for any help!

2

Did you adjust the listen address from listening on 127.0.0.1 to 0.0.0.0?

Ipv6 showing :::8384 is meaningless as I suspect you are using ipv4, so check what ipv4 looks like.

Also, firewalls…

3

Yes, I adjusted the gui listen address in the config file to 0.0.0.0:8384. And I’ve forwarded the port in my firewall. The remote machine is a gcloud vps, and this occurs whether I’m using ufw or not.

4

Right, the problem is beyond syncthing. I suggest you try some other application, I suspect you’ll have the same issue.

5

When accessing a remote from local, the local router isn’t relevant. Maybe your vps hoster doesn’t allow networking on arbitrary ports.

6

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