[Bug 1357] SOCKS proxy attempts fail to some servers due to DNS timeouts

[bugzilla-daemon at bugzilla.mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=1357


Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |dtucker at zip.com.au




--- Comment #3 from Darren Tucker <dtucker at zip.com.au>  2007-09-04 12:03:55 ---
(In reply to comment #2)
> Yes, that fixed it. *sigh*
> 
> Would you not agree that "AddressFamily=any" is still broken in the
> common case (where IPv6 is not used)? It should not hang like it does.

I think the brokenness is in the DNS infrastructure in question.

Quoth RFC4074 (ftp://ftp.rfc-editor.org/in-notes/rfc4074.txt):

"4.  Problematic Behaviors

   There are some known cases at authoritative servers that do not
   conform to the expected behavior.  This section describes those
   problematic cases.

  4.1.  Ignore Queries for AAAA

   Some authoritative servers seem to ignore queries for an AAAA RR,
   causing a delay at the stub resolver to fall back to a query for an
A
   RR.  This behavior may cause a fatal timeout at the resolver or at
   the application that calls the resolver.  Even if the resolver
   eventually falls back, the result can be an unacceptable delay for
   the application user, especially with interactive applications like
   web browsing."


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