Cannot communicate from server to client over OpenVPN S2S connection

[dimskraft]

I have the following S2S configuratiion

Unfortunately, I can connect (ping, netcat, ssh) only from client to the server, but not back.

If I can ssh normally, it means that firewall is not the problem, right? Since packages are travelling in both directions?

Also I can netcat from server to client by a tunnel address of 192.168.27.2, i.e. run

nc -l 1234

on client, and

nc 192.168.27.2 1234

on server and then I see the communication.

What does it mean? How to diagnose the problem?

[dimskraft]

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I made a mistake, I can't connect backwards by any means. But I can see ping traffic with packet capture on a client when pining it from server.