Gateway between 2 networks

PeterUK

Are you sure it SFTP and not FTPS? which would explain why it needs more ports

Normally you can set the passive ports range if not it be 49142-65535 or 1024-65535

GMS98

Here's the SFTP configuration. Note that SFTP doesn't work on SSH either.
Shouldn't the rule contain the port number?
It really only works when opening to all services.
The next step is Wireshark, I suppose.

PeterUK

The built in SFTP is port 990 if you need 2222 make a new service with that port

GMS98

When I tried to find out how to create a new service on the firewall, I found that SFTP was in fact passing through port 115. So I validated the connection with this port and created a new service specifically for my needs. And it works perfectly like that. Thank you very much for your perseverance.