What to do if the tomcat server port number is occupied

To solve the problem of Tomcat port being occupied, you can: determine the occupying process (netstat or lsof); end the occupying process; change the Tomcat port (modify server.xml); disable other applications occupying the port; adjust the firewall settings (Allow inbound connections); modify the hosts file (map localhost to other IP addresses).

How to deal with the Tomcat port number being occupied

When trying to start the Tomcat server, if it cannot bind to Its default port (8080), you may receive an error that the port number is occupied. There are several ways to solve this problem:

1. Determine the process occupying the port

• Use the netstat -ano command on Windows View the ports in use.
• Use the sudo lsof -i tcp:8080 command to view the ports in use on Linux/Mac.

2. End the occupying process

• If the process that is occupying the port is no longer needed, please end it.
• On Windows, use Task Manager to end the process.
• On Linux/Mac, use the kill -9 <pid> command to end the process, where <pid> is the process ID of the process that owns the port.

3. Change the Tomcat port

• Change the Tomcat port number in the conf/server.xml file.
• Find the <Connector> element and modify the port attribute, for example: <Connector port="8081".
• Restart the Tomcat server.

4. Disable other applications

• If you have multiple web applications or services running on the same server, check if There are other applications using port 8080.
• Disable or uninstall these applications and try restarting Tomcat.

5. Adjust the firewall settings

• Check whether the firewall blocks Tomcat from accessing port 8080.
• Allow inbound connections on the firewall to port 8080.

6. Modify the hosts file

• in C:\Windows\System32\drivers\etc\hosts (Windows ) or /etc/hosts (Linux/Mac), map localhost to another IP address, such as 127.0.0.2.
• Restart the Tomcat server and make sure it is bound to the new IP address.

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