Issue Description

Sangfor VPN cannot be build up and check the system logs shown error as figure below.

Error/Warning Logs

Handling Process

1. Go to System > Troubleshooting, enbale the bypass function for the branch public IP then the vpn can be build up.
   

   Root Cause

   Branch device sending the Sangfor VPN request traffic to HQ side and has been recognize the traffic as Dos attack.

   Solution

   Put the branch side public ip in to dos exclusion.
   Path: Anti-Dos/DDos > Traffic Blocks > Dos Exclusion.