How I fixed it:
Open this file with a text editor:
/home/YourUserName/.purple/certificates/x509/tls_peers/omega.contacts.msn.com
Replace contents with:
-----BEGIN CERTIFICATE----- MIIGeDCCBWCgAwIBAgIKfdrgSQAIAAHIuTANBgkqhkiG9w0BAQUFADCBizETMBEG CgmSJomT8ixkARkWA2NvbTEZMBcGCgmSJomT8ixkARkWCW1pY3Jvc29mdDEUMBIG CgmSJomT8ixkARkWBGNvcnAxFzAVBgoJkiaJk/IsZAEZFgdyZWRtb25kMSowKAYD VQQDEyFNaWNyb3NvZnQgU2VjdXJlIFNlcnZlciBBdXRob3JpdHkwHhcNMTAxMTE1 MjEyODE5WhcNMTIxMTE0MjEyODE5WjB2MQswCQYDVQQGEwJVUzELMAkGA1UECBMC V0ExEDAOBgNVBAcTB1JlZG1vbmQxDDAKBgNVBAoTA01TTjEdMBsGA1UECxMUTVNO IENvbnRhY3QgU2VydmljZXMxGzAZBgNVBAMMEiouY29udGFjdHMubXNuLmNvbTCC ASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJnXhdENETaZ8YFfenWCuky3 Fke/oWgUOEbgvaRuZusd2LnvoSiqH++2lkV0JJlIQ+7jLLN8MY7VhlHQmkLC3x44 KZn2IktMVgTBGMKnvbyYVAnRsjt/rVhQrQeHVEQzv5WXx//3FKmXWAuJiuRj9PZ2 KsNqPJgaaa5cuOu4oynO9fH5/ZtJIeUf7bC4Wu++o7jTu5zOhIa7R1buE9FXFF33 vQ1vHi4p9zR2Pi/i2nUpEnzeNCLl/8F/Tf+658SvIC4EzxrYcj+fit6sAnNUfsOE 1SIk9YLD+tS0fln1afbcDvH0ib5Xm7u2/o6ZmxQU0mrAkfQectsKpZLJj03neBsC AwEAAaOCAvAwggLsMAsGA1UdDwQEAwIEsDBEBgkqhkiG9w0BCQ8ENzA1MA4GCCqG SIb3DQMCAgIAgDAOBggqhkiG9w0DBAICAIAwBwYFKw4DAgcwCgYIKoZIhvcNAwcw HQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMBMB0GA1UdDgQWBBRciAVJ/Vsj sAlZoNG/Zs+rILsPNDAfBgNVHSMEGDAWgBQIQuPbThFm87UIxUDbVXwzRhGDODCC AQoGA1UdHwSCAQEwgf4wgfuggfiggfWGWGh0dHA6Ly9tc2NybC5taWNyb3NvZnQu Y29tL3BraS9tc2NvcnAvY3JsL01pY3Jvc29mdCUyMFNlY3VyZSUyMFNlcnZlciUy MEF1dGhvcml0eSg4KS5jcmyGVmh0dHA6Ly9jcmwubWljcm9zb2Z0LmNvbS9wa2kv bXNjb3JwL2NybC9NaWNyb3NvZnQlMjBTZWN1cmUlMjBTZXJ2ZXIlMjBBdXRob3Jp dHkoOCkuY3JshkFodHRwOi8vY29ycHBraS9jcmwvTWljcm9zb2Z0JTIwU2VjdXJl JTIwU2VydmVyJTIwQXV0aG9yaXR5KDgpLmNybDCBvwYIKwYBBQUHAQEEgbIwga8w XgYIKwYBBQUHMAKGUmh0dHA6Ly93d3cubWljcm9zb2Z0LmNvbS9wa2kvbXNjb3Jw L01pY3Jvc29mdCUyMFNlY3VyZSUyMFNlcnZlciUyMEF1dGhvcml0eSg4KS5jcnQw TQYIKwYBBQUHMAKGQWh0dHA6Ly9jb3JwcGtpL2FpYS9NaWNyb3NvZnQlMjBTZWN1 cmUlMjBTZXJ2ZXIlMjBBdXRob3JpdHkoOCkuY3J0MD8GCSsGAQQBgjcVBwQyMDAG KCsGAQQBgjcVCIPPiU2t8gKFoZ8MgvrKfYHh+3SBT4PC7YUIjqnShWMCAWQCAQow JwYJKwYBBAGCNxUKBBowGDAKBggrBgEFBQcDAjAKBggrBgEFBQcDATANBgkqhkiG 9w0BAQUFAAOCAQEAbbWUY/5r/Tv/kefqNUT5aGVejrkbG4229gnJLcv+uQTEg0Gg xfvLr77N1z2j57FameJwz6DeTRbK8MYVPoP+z5o4vM3F3GxLm7aBklYQ/7G0TIp/ 13z01a5aBGvZH8umzex3YrAnhJEcucSN5WaT6r9uwT7imdbsCgfFPdiIgS5iHdcl k/3QSpau+4/XZgh/8V/FMN9KEFYGvEhMb5EVzKJ8pqF9Jy9Mfzqev3BtSREiljCt lJuiRamxWgQoeNVTAI+J2YAsD8Qon1iZiHl08uHdgXWZiGDtLPcd9aIiL7/vi/+D 7w3bhyHPFr+/13BCIWSfKnSRj/g6YoHnhF4gyQ== -----END CERTIFICATE-----
How I fixed it:
Open this file with a text editor:
/home/YourUserN ame/.purple/ certificates/ x509/tls_ peers/omega. contacts. msn.com
Replace contents with:
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-----END CERTIFICATE-----