If the issue only appeared on the specific Lync client, please make sure the Lync client with latest update and test again. Would you please tell us did the issue only appeared on the specific client ?ĭid you try to use another Mac device, is that the same issue ? Start Lync back up, and you should be able to log in. Once imported,ĭouble click the certificate in Keychain and in the Trust section change 'When using this certificate' to 'Always Trust'. cer file to import it into your keychain. cer file, exit Lync on your Mac, double click the. Right click > All Tasks > Export > Next > No, do not export the private key > Select Base-64 encoded X.509 (.CER) > Next > Give itĪ name (fully qualified domain name) > Next > Finish ) with the intended purpose 'Server Authentication' Click on the certificate with the fully qualified domain name (i.e. Expand Certificates > Personal > Certificates Open MMC > Add/Remove Snap-in > Select Certificates > Click Add > Select Computer account > Click Next > Local computer > Finish >
To reimport your Lync server certificate.Īsk your system administrator of the Lync server to export the server certificate and provide to you: To resolve the 'Sign in to Microsoft Lync failed because the service is not available or you may not be connected to the Internet.' you need
This Fixed My issue, I make sure you always allow the trust in the last step.
