On Sun, 29 Sep 2019 04:00:13 -0400 Roger Dingledine arma@torproject.org wrote:
[...]
It looks like you are encountering https://bugs.torproject.org/11211
Alas, I suggest sticking to ipv4 for now -- I think if you got ipv6 working on your obfs4, you would next run into the problem that bridgedb doesn't currently give out ipv6 obfs4 addresses.
I've ran into this problem too. On IRC I was suggested to run a vanilla bridge (without obfuscation) and that's what I've done. In torrc, I have two ORPort lines, one with only the port for IPv4 and one with address:port for IPv6. Dont forget to enclose the IPv6 address in square brackets.