This value is a list of ports, seperated by whitespace, which the proxy will
allow access to. If a user tries to access a port that is not listed here
then access will be denied. This is done for security purposes.
The following ports are always permitted:
- 21 -- FTP
- 70 -- Gopher
- 80 -- WWW
- 210 -- NISO Z39.50 database
- 280 -- HTTP Mgmt.
- 443 -- HTTPS
- 488 -- GSS-HTTP
- 563 -- NNTP over SSL
- 591 -- Filemaker
- 777 -- Multiling HTTP
- 1025-65535 -- Unprivileged Ports