Are there some sort of firewall rules in place for incoming connections?

[LiskoFINAL]

Hi, I have a vpn supporting port forwarding (purevpn) and I have a dockerized qbittorrent instance connecting to openvpn-aio thru socks5. The issue seems that I can get direct incoming connections only via UDP and nothing with TCP. I was using gluetunvpn docker before and after opening the firewall I got incoming connections fully working. With gluetunvpn not supporting socks5 I was connecting with --network=container:gluetunvpn docker option tho. I decided to switch to this because with socks5 updating the VPN container creates less hassles and be fully unattended. So are there some rules that could block incoming TCP connections from VPN to socks5 client? Thanks