Sometimes, few users using RAS (Remote Access Server) / VPN are not able to share desktop.

It is irrespective of other user (from other end) is using VPN or Office wired network.

Note - we have enabled VPN split tunnelling for our environment and the issue is happening after that only.

Also, it is happening with few users not all.
laptop is : HP elitebook 2570p

any resolution ?

Hi,

Did these issued users also meet the issue internal the corporation?

1.  Please double check if the split tunnel VPN setting configure correctly with the help of the link below:

http://blogs.technet.com/b/nexthop/archive/2011/11/15/enabling-lync-media-to-bypass-a-vpn-tunnel.aspx

2.  As the issue only happen for a few users who using VPN, please try to delete Lync user profile and then test again.

3. Please also try to change another computer with the issued Lync account using VPN to test the issue.

4. Please also try to test the issue with Internet network instead of VPN to test the issue again.

Best Regards,

Eason Huang