Previous version was 6.3.1.4. Upgraded to 6.40.01. The Sonicwall is at a different company than mine, so that's all I can tell you.

We were trying to connect a SonicWall to a Cisco VPN3000 concentrator with similar problems. Upgrading to Sonicwall firmware 6.4.0.1 did the trick.

The Cisco 501 or 506e will look like a VPN hardware client to the concentrator (remote session rather than LAN-to-LAN session) The Cisco literature says that they support up to 10 connections. Pay attention to the limits of the number of connectio...