I am currently having a problem where I am using an ISA server as the default gateway for a Windows 2003 Server running SP1. This server is running in a virtual machine in Virtual Server 2005 R2. This server is able to establish TCP connections to anything without any problems. However, nothing can establish connections to it. What seems to happen is this server will respond to the incoming connection but the ISA server will drop the response with the error: FWX_E_TCP_NOT_SYN_PACKET_DROPPED. Does anyone have a solution for getting around this problem? I think it is an issue with Virtual Server since I cannot get physical Windows 2003 servers with the ISA server as their default gateway to duplicate this behaviour.
Thank you for your help in advance.