Lync for mac 2011 not working in corporate LAN

Hi guys,
I have a mac client that has newest version 14.0.10 of lync installed. The Mac works on OS X Yosemite
operating system. The problem is that when you connect to corporate LAN, lync never connects and gives
following error:
Sign in to Microsoft Lync failed because the service is not available or you may not be connected to the Internet.
If you share a connection via mobile or connect via outside network, you are able to log in and lync functions properly
I have tried to update root certificate on mac via copying one from windows client, but with no luck.

Hi Itseeker1,
As ErikHMac stated, the new version of Lync for Mac 14.0.11 has been released, you can install it and check if the issue is solved.
I know you have installed the root certificate on Mac, but please check it again and make sure the certificate is issued by an Enterprise Certificate Authority (Internal CA) and
also should be trusted by the Lync Server.
In addition, it looks like an Internet connectivity issue, please try to flush the DNS cache by running the following command.
dscacheutil -flushcache
Hope it can be helpful.
Best regards,
Eric
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0x9059b000 - 0x90800ff7 com.apple.AddressBook.framework (8.0 - 1365) <6D80FC70-269E-3C12-A9B4-279F27C58BEF> /System/Library/Frameworks/AddressBook.framework/Versions/A/AddressBook
0x9102b000 - 0x91032ffe com.apple.agl (3.2.3 - AGL-3.2.3) <E26A1D2C-596E-31F0-8E70-FC381874F8DA> /System/Library/Frameworks/AGL.framework/Versions/A/AGL
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0x94f26000 - 0x94f7bff7 com.apple.QuickLookFramework (5.0 - 622.3) <3C6ADC02-2C67-361B-B042-47DDCC0EDA5F> /System/Library/Frameworks/QuickLook.framework/Versions/A/QuickLook
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I've checked out all the forums and walked through some of the steps and I think I figured out my issue: I have NO certificate in my keychain whatsoever; Known or unknown. My account/system administrator here is unsure how to get me a certificate because
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