I get a “peer no longer responding” error message when my Linux Client 3.5 tries to establish an IPsec connection to a PIX or to a VPN 3000 Concentrator. What should I do?
A. The symptom of this problem is that the Linux Client seems to try to connect, but it never gets a response from the gateway device. The Linux OS has a built-in firewall (ipchains) that blocks UDP port 500, UDP port 1000, and Encapsulating Security Payload (ESP) packets. Since the firewall is on by default, you either have to disable the firewall or open up the ports for IPsec communication for both inbound and outbound connections to fix the problem.
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