Just implemented Sophos UTM 9.2 this week and was kinda annoyed that the Lync 2013 client keeps popping up asking for username and password constantly... it only dawned on me once I had fixed a similar problem with iTunes that perhaps I could implement a similar fix for Lync 2013 Client [[:)]]
Simply do this:
Login to the Webmin and go to 'Web Protection/Filtering Options/Exceptions'
Now clone the 'Apple Update' exception and change the domain to be what ever your Lync frontend is.
Before you save out tick under the skip list 'Authentication'
Assuming you have the right host/domain that your clients are talking to you should find that the Lync Client is no longer asking for a username & password! [[:)]]
Enjoy!
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