[Pidgin] #15775: Unable to validate certificate

[Pidgin]

#15775: Unable to validate certificate
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 Reporter:  lino    |      Owner:  sulabh.dev
     Type:  defect  |     Status:  new
Milestone:          |  Component:  Yahoo!/Yahoo! JAPAN
  Version:  2.10.7  |   Keywords:  yahoo certificate validate
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 Hi, I've been using Yahoo in Pidgin for long time, it's fine until today.
 I suddenly cannot login. I can login fine in Yahoo Messenger.

 Today I got the error 'Unable to validate certificate, The certificate for
 login.yahoo.com could not be validated, The certificate chain presented is
 invalid'.

 I have the debug log and certificate attached.

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Ticket URL: <https://developer.pidgin.im/ticket/15775>
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