Changing Port Numbers
Ports serve as endpoints for communicating with other devices. Typically, conventional port numbers are used for major protocols, but devices that use these port numbers are vulnerable to attacks because these port numbers are well-known. To enhance security, your Network Administrator may change the port numbers. When a port number has been changed, the new number must be shared with the communicating devices, such as computers and servers. Specify the port number settings depending on the network environment.
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To change the port number for proxy server, see Setting a Proxy.
To change the port number for LDAP server, see Registering LDAP Servers.
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1
Select <Menu> in the Home screen. Home Screen
2
Select <Preferences> 
<Network>.
<Network>.If the login screen appears, enter the correct ID and PIN. Logging in to the Machine
3
Select <TCP/IP Settings> <Port Number Settings>.
<Port Number Settings>.4
Selecting the protocol of which you want to change the port number.
Learning more about the protocols
<LPD>/<RAW>/<WSD Multicast Discovery> Configuring Printing Protocols and WSD Functions
<HTTP> Disabling HTTP Communication
<POP3>/<SMTP> Configuring E-Mail/I-Fax Communication Settings
<Multicast Discovery> Monitoring the Machine from the Device Management Systems
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Enter the port number, and select <Apply>.
6
Restart the machine.
Turn OFF the machine, wait for at least 10 seconds, and turn it back ON.