RUT956 - No profinet communication on any LAN port

Hi there!
I used a RUT955 with legacy firmware about 2 years for OpenVPN Connection over LTE and as a local switch (including WAN port as a LAN port) in an external office. This worked great.
Now the RUT955 suddenly dies and i installed a RUT956 with firmware 07.07.1 in same configuration.
VPN works, but now local traffic with profinet protocol (Layer2) between devices connected through teltonika LAN ports does not work anymore.
It works instantly when i replace RUT956 with a cheap 5 port switch …
“Normal” ip traffic works local and over VPN without any problems.

What can i do to make local profinet working again?

Best regards

Nobody an idea? :thinking:

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