1. Introduction
The Error Code EADDRINUSE is typically encountered on a device running Node.js, a popular open-source Javascript runtime environment used for hosting and serving websites. Most users see this error when launching a Node.js server and find that their desired port number is already in use.
2. What Does Error Code EADDRINUSE Mean?
Literally speaking, EADDRINUSE translates to ‘Error: Address in Use’. In plain language, this implies that the port needed by your server to communicate is already in use by another application or service. The system is unable to host multiple communications over the same port, hence making this an issue.
3. What Causes This Error?
Some common reasons why the error EADDRINUSE may appear are:
– Another application is using the port.
– Your application ended previously and did not free the port properly.
– The port is being held in a TIMED_WAIT state by the system, due to recently stopping a server running on that port.
4. How to Fix Error Code EADDRINUSE
Fix #1: Kill the process that is occupying the port. This can often be done with commands such as `kill` in Linux or Mac systems or Task Manager in Windows.
Fix #2: Change the port number that your server is using.
Fix #3: If all else fails, a system restart may do the trick.
5. Additional Tips
Always ensure that the ports needed by your server are free and not being used by any other application. Regularly monitor your server to understand when it ends and if it has freed the port correctly.
6. When to Contact Support
You should contact professional support if the error persists after trying the suggested solutions or if you’re unsure how to perform the fixes.
7. Conclusion
Error Code EADDRINUSE is a common problem in Node.js server environments when a desired port is already in use. While it can be frustrating, it is generally easy to fix by either killing the existing process, changing your server’s port, or restarting your system. Make sure to regularly monitor your servers to prevent such errors from occurring.
Optional Additions:
– Related error codes: ECONNREFUSED, EBADF.