If you have an established SSL VPN and it suddenly stops working, it may be the IPS settings. Here are the symptoms:

  • Sonicwall SSL VPN has been working fine and then suddenly stops working.
  • No configuration changes have been made to the Sonicwall device.
  • The SSL VPN client is able to connect.
  • Once connected you cannot access the LAN subnets
  • In the case of tunnel all mode, you cannot access LAN or WAN

This can happen in cases where IDS/IPS is set to prevent low priority attacks. The IPS can block IPSec traffic from the SSL VPN tunnel.

To correct this issue, navigate to Security Services –> Intrusion Prevention and uncheck Low Priority Attacks in the Prevent All column.

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