Listening Port and Direct Connection

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I searched in this forum and checked the page about ports, but it still won't work. I have two locations, a pfSense firewall and a QNAP NAS behind the firewall in each location: 

Location A has the listening port set to 50001, location B has the listening port set to 50002. 

pfSense A has a firewall and a NAT rule to allow/forward port 50001 UDP/TCP, location B has the same for 50002. 


But still the file transfer between the locations only wirks with relay mode. Can anyone show me the error here?

Thank you and best regards! G

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