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Trying to connect a OpenVPN Connection to third party server

Hi Guys, 

we have a network running with multiple sites. All the Sites are connected via IKEv2 Tunnel to our Sophos XG330 (via Lancom Routers).

In each site we have a device running which is trying to connect (via OpenVPN Tunnel) (UPD Port 1194)  to a third party server (external IP Adress).

But for some reason the connection wont work. If only one device is connected, tunnel is running fine. As soon as i am connecting a second device, traffic is not working. It seems to be connected for a few minutes sometimes, but then its gone again.

I have checked all my rules on XG. If I'm running the policy tester, everything is fine.

I already checked with Sophos Support, but that did not help a lot. 

Their conclusion from logs was: 

Our XG is recieving Answer Packages from the Third Party Server, our XG never sent out (Packets with unknown ports) -> so the packets get dropped.

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