Hello,
I had been running strelaysrv on a Debian server with dual-stack Internet connectivity for about a month without any problems, until today, when I discovered this in my logs (dates and times shown are in UTC +3:00):
strelaysrv[577]: 2016/09/02 00:08:32 pool.go:35: Failed to join https://relays.syncthing.net/endpoint due to an internal server error: too many colons in address 2a02:587:9406:101::1:44476
strelaysrv[577]: 2016/09/02 01:08:32 pool.go:35: Failed to join https://relays.syncthing.net/endpoint due to an internal server error: too many colons in address 2a02:587:9406:101::1:44478
These are the first two occurrences of the message, which has repeated itself hourly since then. As expected, my relay does not appear on relays.syncthing.net.
Strelaysrv is at v0.14.4, the most recent one available from Debian’s repository. TCP ports 22067 and 22070 are reachable over IPv4 and IPv6. A local instance of BIND9 is used for name resolution.
relays.syncthing.net resolves as follows from here:
relays.syncthing.NET is an alias for web.syncthing.net.
web.syncthing.NET has address 46.101.130.230
web.syncthing.NET has IPv6 address 2a03:b0c0:3:d0::18d6:8001