Two computers cannot connect at the same time from home using Cisco client to connect to a PIX 515e over a DSL having integrated router capabilities. When one user connects, all is good. As soon as the other user (computer) connects, it disconnects the first user. Beyond enabling NAT Traversal on the PIX, what has to be configured to allow two concurrent VPN clients? In reading multiple posts on these sort of questions, two things keep popping up - NAT Traversal and firmware of the home router itself (IPSec passthrough issues).