We have been experiencing issues when RDP to a server via L2L VPN Tunnel or/and via Cisco VPN Client.
The issues started to happen since we upgraded an old PIX515E with an ASA5520.
The users only reported RDP problems, for example, The RDP session will hang for 10 seconds and reconnect, or it will freeze for 5 to 10 seconds at random times. We could not find a pattern for this issue. Sometimes happened twice every hour and sometimes won't happened at all.
After opened multiple TAC cases with Cisco VPN specialist, the issue was still on (they couldn't find anything wrong.
So i decided to start searching for similar issues online.
I found a forum with a person describing the same problem with RDP connection running an ASA.
He described he used to have a PIX and no problems, and since they upgrade to an ASA they start having same issues we have.
The good thing is that he found a solution.
He added the following command to the ASA
Timeout conn 0:0:0 (since the Cisco ASA default is 1:0:0) and this fixed the issue for him.
I've added this command yesterday and looks like the we haven't got any issues since then.
Can someone please explain to me what does this command exactly do?
Why this command will fix the RDP issue?
Why this command has to be changed on the ASA from the default when it is not a problem on a PIX?
Hope you can help me,