watchguard firewall and "tcp syn checking failed"

[efantiproxmox]

Hello everyone.

I'm trying to use a Proxmox server in a subnet behind a Watchguard firewall.

I can not manage the server's web interface Proxmox.
Unfortunately I have the problem that had enabled the firewall control "tcp syn checking" (is a global setting).


With tcpdump I see the packets arrive at the server Proxmox, but then I have the firewall logs the message "tcp syn checking failed", and I have no chance to have easy access to the Proxmox server on its web interface.

Please, you have an idea on this issue?

thanks

Enrico

 

[efantiproxmox]

Hello.

I solved it by removing the configuration of the network bridge.

Using only container with OpenVZ I have no problems.