[Pidgin] #15486: pidgin/purple fails with "The certificate chain presented is invalid."

[Pidgin]

#15486: pidgin/purple fails with "The certificate chain presented is invalid."
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 Reporter:  calestyo  |       Owner:
     Type:  defect    |      Status:  new
Milestone:            |   Component:  libpurple
  Version:  2.10.6    |  Resolution:
 Keywords:            |
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Comment (by chr.istoph):

 I can confirm this bug using the XMPP server at 5222.de. The server
 certificate is signed by CACert and is accepted as valid by 'openssl
 verify' 'vfychain' (libnss3-tools).
 I have connected to the server using the XMPP client psi, and the
 certificate is readily accepted.
 For testing, I rebuilt pidgin with gnutls instead of libnss. This testing
 version does not show any certificate error anymore.

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Ticket URL: <https://developer.pidgin.im/ticket/15486#comment:8>
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