We are having issues with our IPSEC tunnel not working. It was working previously for a while but then all of a sudden it stopped working. We have a Windows 2008 R2 standard server (source) that will initiate the tunnel to a Windows 2003 server (destination). We have network monitor installed on both servers and see the traffic leaving the Windows 2008 server and arriving at the Windows 2003 server. However, we do not see return traffic leaving the Windows 2003 going back. There is a Cisco ASA firewall that sits b/t these servers and it has rules in place to allow communication b/t the servers. We are not seeing any traffic being dropped by the Cisco ASA firewall. Thanks for any help given.

Using Cisco IPS Sensor Software Version 6.x, the Cisco AIP-SSM combines inline prevention services with innovative technologies to improve accuracy. The result is total confidence in the protection offered by your intrusion prevention system (IPS) solution, without the fear of legitimate traffic being dropped. When deployed within Cisco ASA 5500 Series appliances, the AIP-SSM offers comprehensive protection of your network by collaborating with other network security resources, providing a proactive approach to protecting your network.Mark Van Deibert