VBAN over VPN only works in one direction

[HGA1]

Hi Vincent,

I try to use VBAN via a SSL VPN connection (Sophos).
If I connect the notebook to the LAN, everything works fine.

Now I have set up a VPN Connection between the the Notebook (kaba) and the LAN.
The LAN has the the address range 10.0.0.0/24.
The notebook has the IP address 192.168.42.51 und 10.242.2.2 for the LAN.
The Server, which is physical on the LAN (10.0.0.10) recognized the IP address of kaba and also is able to recieve a stream from kaba.
From 10.0.0.10 I have set up an outgoing stream and it looks good, in the field IP Address kaba has a green spot "i" in a square.
The same situation for the Outgoing stream.

But kaba does not detect any incoming stream.
I also have open in the Fritz!Box a UDP port 6980. It is only a try, because I thing it will not help, because the VPN tunnel goes through FRITZ!Box.

Any idea, why it only works in o direction?
What additional test I could try?

[HGA1]

I found the problem!
For the Sophos UTM SSL VPN connection the automatic firewall rule was only for one direction. After I added a firewall rule for the other direction too, everything works fine.