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UFW port forwarding

I use UFW and here is my setup: eth0 is configured as a bridge interface (br0): inet adr:10.0.4.10 Bcast:10.0.4.255 Mask:255.255.255.0 eth2 is connected to a private network: inet ...
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How to find out what is blocking a port

I have 3 machines: Machine A - local network Machine B - local network Machine C - external network Local network has a dynamic IP and Dyndns is set up to forward it. I have ssh on Machine B ...