After updating to 0.12.2 on ubuntu and 0.12.1 on android devices won't connect

Support Android
1

After updating syncthing on Android to the current version, which uses syncthing 0.12.1, my Android (6.0) device won’t connect to my notebook running ubuntu 14.04.

With STRACE=discovery,connections, I get the potentially suspicious line on Android:

connections.go:285:INFO: Failed to parse connection url: tcp://[....%wlan0]:22000 parse tcp://[...%wlan0]:22000: hexadecimal escape in host

Any recommendations?

Regards, Tom

2

There have been github issues about that problem. The current one is …

If you don’t use IPv6 on your Ubuntu machine, you can disable that to workaround that issue.

3

The problem only affects local IPv6 discovery though; local IPv4 and global discovery should work just fine.

4

Thanks for the hint. After disabling ipv6 as described at https://askubuntu.com/questions/440649/how-to-disable-ipv6-in-ubuntu-14-04 the message has disappeared from the log on the Android device. Now I get:

local.go:172: received local announcement
connections_tcp.go:43 connection timed out
connections.go:285 dial failed

The log on the Ubuntu side doesn’t show much.

Is there anything I can do?

5

Connection timed out sounds like a genuine network or firewall problem.

6

I didn’t change anything though.

On Ubuntu the log looks quite different from the Android log. Here I get:

[...] 2015/11/13 13:02:01.263572 cache.go:99: DEBUG: lookup for ... at IPv6 local
[...] 2015/11/13 13:02:01.263626 cache.go:100: DEBUG:   direct: []
[...] 2015/11/13 13:02:01.263673 cache.go:101: DEBUG:   relays: []
[...] 2015/11/13 13:02:01.263572 cache.go:99: DEBUG: lookup for ... at IPv4 local
[...] 2015/11/13 13:02:01.263626 cache.go:100: DEBUG:   direct: []
[...] 2015/11/13 13:02:01.263673 cache.go:101: DEBUG:   relays: []

I only use local lookups.

Is there anything I can do?

7

It’s your firewall, read the guide on how to setup your firewall. Also, make sure your listen addresses are reasonable.

8

Ok, you’re right. I don’t quite understand what has changed though but this seems to have caused the problem. Thanks a lot for pushing me to review my firewall rules.

9

For the records: I had udp:21025 unblocked. Now syncthing seemingly requires udp:21027 to be unblocked.