Public bug reported:

The upgrade from libgnutls13 (1.4.4-3build1) to 1.6.3-1build1 introduced
something that i suppose to be bug, though I cannot really track down
the problem.

The function SSL_connect returns in the new version with
SSL_ERROR_ZERO_RETURN (meaning that the TLS-connection has been closed)
when changing a current socket to a TLS-connection. I guess that it does
not like something about the remote certificate, however the error-level
does not indicate this. tcpdump indicates that the error appears after
receiving the remote certificate.

I found this problem when trying to wput a file to a TLS-enabled proftpd-server.
Using it in current gutsy, it won't be able to able to make a TLS-connection. 
However when compiled agains libgnutls13 1.4.4-3build1 it suddenly starts to 
work. It does not work either though for the 2.0.4-version in hardy.

** Affects: gnutls13 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
SSL_ERROR_ZERO_RETURN for no reason
https://bugs.launchpad.net/bugs/175930
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