I have my Pi's on a NetGear router which is itself connected to another Firewall and then to my DSL modem/router connection. Except for this issues all is working FINE.
I have 4 Pi's on the Netgear, 3 Wheezy OS's and one Jessie. The Jessie is the issue and is a new build with latest updates. I have added port 9000 to the /etc/ssh/sshd_config file. From the Netgear network I can access all of my Pi's via each ones unique port number, as well as port 22.
From the Firewall network, the DSL modem/router network and the Internet I can get, via the correct port numbers, to each of the Pi, except the new Jessie build.
Is there something I'm missing here? Something new in Jessie?