I have a customer that has been using a Cisco PIX 506E to Cisco PIX506E site-to-site VPN tunnel that I set up around 5 years ago. I have recently purchased a new Cisco ASA 5510 to replace one of the 506s. When the ASA 5510 is in place, RDP connections across the VPN tunnel to a terminal server are randomly disconnected. I have swapped the 506E back into production and the connections NEVER drop.
In an effort to troubleshoot, I downgraded the ASA 5510 to v7.23 from8.0. Problem instantly reoccurred. I have called TAC to confirm the configuration is correct, which it is.
The other 506E is running v6.3.5.
I have plenty of other mixed VPN tunnels (v7 and v6.3.x) which have had no problems.
Could this be a bad device? or am I missing something? After I receive responses here, I may RMA the 5510.