A VIA client tries to connect to a corporate office controller through an intermediate firewall. However, the VPN connection fails. The administrator examines the firewall rules and determines that rules for TCP 443 and UDP 500 are configured. Which additional protocol must be allowed in the firewall rules to resolve this connection failure?

Question

Quizplus · Accepted Answer

UDP 4500 is used for NAT-T (NAT Traversal) in IPsec VPNs, which is necessary when a VPN client is behind a NAT device.

A VIA Client Tries to Connect to a Corporate Office