[Koha] Running z39.50 behind a firewall-which ports to open

Hi all, We are running our newly installed koha 3 behind a firewall. Each time we try to use the z39.50 facility, we are getting a connection timeout. I am suspecting there should be some ports eg tcp 210 that should be opened on the firewall. I will appreciate any help. Kind Regards, Admire Mutsikiwa (Mr) ICT Projects Manager Library IT University of Zimbabwe Tell:+263-4-303276 Cell:+263-92239187 Alt/email:amutsikiwa@gmail.com