MSN havent updated all of their servers to the new cert version, so this was causing intermittent problems. The fix here is updated (if you dont want to or cannot upgrade to latest version yet) and the below information is correct and working as of 24/11/2010.

So your Pidgin chat under Linux or Ubuntu is giving SSL ‘Unable to validate certificate error’ when connecting to MSN’s omega.contacts.msn.com server? Don’t worry you are not alone, this is happening to a lot of people (see here). Here I’m going to tell you how to fix it so you can get chatting again.

A lot of advice is flowing around to update to the latest pidgin to fix the problem, many people are reporting upgrading does not resolve the issue, so these steps will manually insert the new certificate.

Step 1 – Up
Download Microsoft_Internet_Authority_2010.pem and Microsoft_Secure_Server_Authority_2010.pem

Step 2 – Install
Place those files in /usr/share/purple/ca-certs (or /usr/local/share/purple/ca-certs depending on your *nix distribution (note that you may need to remove the ‘_2010′ from the files if you find the problem remains)

Step 3 – Use
That should be all you need to do to log into MSN! Give it a go :)

Thanks to Mohammed for the updated info. You can find the full info from Pidgin here

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    You’re a life saver. Thanks for your surgical tip. The «tumor» was extracted precisely !

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    December 2, 2010 Reply to this comment
  11. Hey,

    This solution was the one that actually works. Everybody’s innate feeling is to connect to omega and download into peers. This one, however, got it right!

    John Ortega
    Madrid Linux Users Group

    December 2, 2010 Reply to this comment
  12. Samuel Truthseeker

    Pidgin user – Thanks a lot, easy and worked like a charm.

    November 30, 2010 Reply to this comment
  13. Joey

    Worked like a charm on Ubuntu 10.04 :)

    Cheers, and thanks a lot!

    November 30, 2010 Reply to this comment
  14. Thanks for the solution.
    pidgin team post the MSN cert issue check the below link

    November 24, 2010 Reply to this comment

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