Microsoft Lync 2010 continuously asks for credentials after signing in

Hi,
we have lync 2010 frontend server at our office, it is working fine for the all the users, but one user who will connect our network through VPN it will continuously prompts for credentials eventhough if we are providing right credentials, because of this
user will be not able to recieve emails from his outlook. all other VPN users working fine. how to troubleshoot this issue, please any help?
Regards
Asha

Hi,
The issue may occur if the Outlook integration is not correctly on this client after connecting through VPN. What is the
difference for the location or sign in type between this user and other working users?
Lync generally only prompts you for credentials after you are logged in when it must connect Lync to a linked service such as the Microsoft Exchange Free/Busy service or the Calendar service.
If Lync continues to ask for credentials after three separate dialog prompts, there is likely an issue with Outlook integration or with the Exchange services themselves. I suggest referring to the following information to check the issue.
http://support.microsoft.com/kb/2298541
http://support.microsoft.com/kb/2436962
Regards,
Kent

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