Can’t sign in with MS Lync

I was able to resolve this issue in two steps.

1. I imported the root certificate from my corporate Lync Server to my MacBook Pro and configured it as Always Trust(ed) for all options
2. I generated a kerberos ticket on my MacBook Pro using the terminal command kinit

The level of trust on the root cert maybe overkill, but it works. I have to regenerate the kerberos ticket periodically otherwise I am not able to sign-in to Lync, but I resolved this with an Automator app that runs the kinit command when I login to my MBP.

Hope this helps someone down the line. Cheers!

See this link.

Basically, you have to edit the plist for Lync, and enter a registry key equivalent.

The explanation is below:

Basically, the equivalent to the registry keys for windows needs to be entered in the Lync config plist file on the mac, a file named MicrosoftLyncRegistrationDB.xxx.plist that you can find in ~/Library/Preferences/ByHost.

In it, you will need to create an entry for each segment of the reg key path for the DisableServerCheck flag (all lower case). It should look like this:

hkey_current_user\

hkey_current_user\software\

hkey_current_user\software\policies\

hkey_current_user\software\policies\microsoft\

hkey_current_user\software\policies\microsoft\communicator\

hkey_current_user\software\policies\microsoft\communicator\disableservercheck

The value for each of the path segments is "<>" and type string. For the disableservercheck flag, the type is "Number" and the value is 1.

You can use a plist editor (there's a few free ones for the mac, or you can also use Xcode) to edit the plist file. The screenshot below shows you how it should look like.