The Port numbers are divided into three ranges:

• Well Known Ports (0 to 1023)

• Registered Ports (1024 to 49151)

• Dynamic and/or Private Ports (49152 to65535).

The Well Known Ports and the Registered Ports SHOULD NOT be used without IANA registration (the registration procedure is defined in [RFC4340], Section 19.9.).

When using numbers in the range 0 to 49151 other functions could be non-functional caused by a port-conflict.

The Dynamic / Private Ports can be used without problems.

More information can be found i.e. on www.iana.org/assignments/port-numbers (external link).

When you encounter problems with the used port, please check your firewall settings.