How to troubleshoot Cisco VPN Pass-Through on Netgate router

Authored by: Support.com Tech Pro Team

1. Introduction

How to troubleshoot Cisco VPN Pass-Through on Netgate router

2. Resolution

If trouble is encountered when attempting a connection from an internal Cisco VPN client to an external host, (e.g. a workstation with the Cisco client is trying to get out through a pfSense® firewall to connect to a “foreign” site), then try the following.

Workaround

• In the Cisco VPN client software, Modify the connection and turn off transparent tunneling completely in the Transport tab.
• In the pfSense webGUI, under Firewall > NAT on the Outbound tab:
• Enable Manual Outbound NAT.
• Remove any NAT rules that perform static port NAT on udp/500.