I have a Windows XP SP3 user with Sonicwall Global VPN client installed (version 4.2.6.0305). This has been installed for some time and works absolutely fine. I've recently had to install the Cisco VPN Client (version 5.0.07.0290) on the same machine. It now seems that Windows doesn't like having both VPN's running at the same time, regardless of whether the connection is alive.
The user is having to disable Sonicwall and stop the software from running before establishing a VPN connection with the Cisco client.
The Cisco software is the most recently installed and was done so when antivirus was running - if it is re-installed with AV disabled will that make the difference?