This is the port that one Ariel system uses to connect to another Ariel system. In addition, Ariel needs to have access to ports in the range of 1024-5000 to send data, so access to these ports will also have to be made available. If a site blocks the use of any of these ports, Ariel will not be able to send or receive files. These ports need to be opened in both directions. Use Ariel's e-mail facility.
Few firewalls prevent e-mail transmissions.
E-mail requires a POP3 server. Some negotiating with the mail administrator may be needed to secure sufficient disk space on the POP server. See question 1.4 above. Get your network administrator to open up the ports listed above. With some firewalls, this can be done so that only the Ariel machine, not all the machines behind the firewall, have access to these ports.