- The port is already in use by another program: it could be because another program is using the same port, preventing Tomcat from starting.
- Firewall blocks port access: The firewall might prevent Tomcat from communicating using the specified port.
- Network issue: it may be due to unstable network connectivity or inaccessible ports.
- Configuration error: This could be due to an incorrect port specified in the Tomcat configuration file, causing it to not start.
- The Tomcat service is not running, possibly because it has not been started or has been stopped, causing the port to be invalid.
- Ports are restricted: The operating system or network device may restrict certain ports, causing Tomcat to not function properly.
- Port conflict: It may be due to a conflict between Tomcat and other applications, causing the port to be invalid.
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