Public bug reported:

Binary package hint: libgnutls13

Description:    Ubuntu 8.04.3 LTS
Release:        8.04

I have a machine running Ubuntu hardy which uses a remote ldap server
for authentication and has been working smoothly for about two years
now. Today, after upgrading libgnutls13 from 2.0.4-1ubuntu2.3 to
2.0.4-1ubuntu2.5 all the ldap queries failed. It appeared that gnutls
was rejecting the self-signed certificate presented by the ldap server.

/var/log/auth.log reported these errors: "nscd: nss_ldap: could not
search LDAP server - Server is unavailable"

The log on the ldap server showed incoming connections which then
immediately would unbind again.

Doing a standalone ldapsearch against the server resulted in the error:
"TLS: peer cert untrusted or revoked (0x42)."

After downgrading libgnutls13 back to version 2.0.4-1ubuntu2.3 the ldap
queries succeeded and users could once again login to the system. Note,
however, that a standalone ldapsearch still gives the error message
above.

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

-- 
libgnutls13 rejects ldap server's self-signed certificate
https://bugs.launchpad.net/bugs/397636
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