Why Did the L2TP VPN Connection Stop Working

Zyxel_Emily

Question:
L2TP VPN connection stops working. What settings can I check?

Answer:

1. Check the local policy setting: The range 192.168.50.1 - 192.168.50.250 is the L2TP VPN client pool. Ensure that the local policy is not set to this range. Instead, set it to 0.0.0.0.

2. Verify the NAT rules: Review NAT rules to ensure that ports UDP 500 and UDP 4500 are not forwarded unnecessarily to another IP address. Disable or update the rules as needed.