How to disable ports not used by computers

how to disable ports not used by computers

Each Service corresponds to a corresponding port. For example, the WWW Service port in zookeeper is 80, SMTP is 25, and FTP is 21, these services are enabled by default during Win2000 installation. It is unnecessary for individual users to disable the port, that is, to disable useless services.
Configure it in "service" in "Administrative Tools" on "Control Panel.
1. disable ports 7 and 9: Disable Simple TCP/IP service and support the following TCP/IP Services: character generator, daytime, discard, ECHO, and quote of the day.
2. disable port 80: Disable the WWW Service. The "service" is displayed as "World Wide Web Publishing Service", which provides Web connection and management through the management unit of Internet Information Service.
3. disable port 25: Disable the Simple Mail Transport Protocol (SMTP) Service. It provides the function of sending emails across networks.
4. disable port 21: Disable the FTP Hing service, which provides FTP connection and management through the management unit of Internet Information Service.
5. disable port 23: disable the Telnet service, which allows remote users to log on to the system and run the Program on the console using the command line.
6. It is also important to disable the Server Service, which provides RPC support, file, printing, and named pipe sharing. Turn Off Win2k's default share, such as IPC $, C $, and ADMIN $. Disabling this service does not affect other operations.
7. Another port is port 139, and port 139 is the NetBIOS session port, which is used for file and print sharing. Note that port 139 is also enabled for Unix machines running Samba, functions are the same. In the past, Traffic 2000 was used to judge whether the host type of the other party was inaccurate. It is estimated that port 139 was opened as an NT host, and now it is better.
to disable the 139 listener, select the "Internet Protocol (TCP/IP)" attribute in "Local Connection" of "network and dial-up connection, in "Advanced TCP/IP Settings" and "wins Settings", enter "disable Netbios for TCP/IP". If you check the box, port 139 is disabled.