DNS resolution sometimes fails
While running the 0.15 test suite, it happened that Claws Mail could not connect to a mail server. It was clearly DNS related: running
host mail.example.com also fails, but
host mail.example.com 127.0.0.2 succeeds. After the second command claws is happy due to the DNS cache. I guess we have a serious regression from
feature/remove-pdnsd that only affects "DNS leaks", i.e. when the system resolver (Tor) is used. Urgh. Oh and
tor-resolve mail.example.com works just fine.
Next thing to do: test if that's still the case.
If it is, perhaps we could simply get some caching DNS resolver back (and maybe pick unbound this time).
It seems than only non-SOCKS applications are affected.
#1 Updated by foob about 5 years ago
- Description updated (diff)
- Starter set to No
It may be related to this TOR bug https://trac.torproject.org/projects/tor/ticket/11741. It cause the Tor resolver to fail if a DNS answer is >512B.
If examples of such failing domain names are found. One can see the record size using
dig $host | grep MSG size
outside of tails.
#2 Updated by BitingBird about 5 years ago
https://trac.torproject.org/projects/tor/ticket/11741 is a duplicate of https://trac.torproject.org/projects/tor/ticket/4734 which should be followed for news.