hi There, in my environment, none of the users are able to share their desktop with remote domain users. call fails as soon as they make any sharing. looking at the Lync diagonostic report I see the below error. Any idea what must be wrong in my environment, as i'm clueless to move further on this issue?

Note: This issue does not occure when they are in the local LAN, but it hapens when they use internet or wifi network. Is it something i need to validate from network aspect? 

Below the Diagnostic header from monitoring server:

• Edited by Magudeeswaran M Saturday, October 25, 2014 12:49 PM

this issue was fixed after we fine tune our firewall settings, here is what we did.

Basically Lync is using an anonymous Cipher (TLS_DH_anon_WITH_RC4_128_MD5) for TCP traffic, this was previously not allowed in our firewall so the connections were dropped by firewall, hence we had to enable this in fireall in order to resolve this issue. you may either enable TCP or UDP for this chipher, but UDP is the most preferable option.

• Marked as answer by Magudeeswaran M 5 hours 33 minutes ago

this issue was fixed after we fine tune our firewall settings, here is what we did.

Basically Lync is using an anonymous Cipher (TLS_DH_anon_WITH_RC4_128_MD5) for TCP traffic, this was previously not allowed in our firewall so the connections were dropped by firewall, hence we had to enable this in fireall in order to resolve this issue. you may either enable TCP or UDP for this chipher, but UDP is the most preferable option.

• Marked as answer by Magudeeswaran M Wednesday, August 19, 2015 1:56 AM