Jenkins won't start: Failed to listen on port 8080

Question

I am using Jenkins and since yesterday it has stopped working. I looked at the Windows Service and it had been stopped (somehow). I restarted it but it stopped immediately after. I have looked in the directory where the service is running from (C:\Program Files\Jenkins) and opened the log file in there called jenkins.out.log. This is what it says ``` Running from: C:\Program Files\Jenkins\jenkins.war webroot: EnvVars.masterEnvVars.get("JENKINS_HOME") [Winstone 2012/05/17 10:14:42] - Beginning extraction from war file Jenkins home directory: C:\Program Files\Jenkins found at: EnvVars.masterEnvVars.get("JENKINS_HOME") [Winstone 2012/05/17 10:14:44] - Winstone shutdown successfully [Winstone 2012/05/17 10:14:44] - Container startup failed java.io.IOException: Failed to start a listener: winstone.HttpListener at winstone.Launcher.spawnListener(Launcher.java:250) at winstone.Launcher.<init>(Launcher.java:202) at winstone.Launcher.main(Launcher.java:398) at sun.reflect.NativeMethodAccessorI…

Accepted Answer

Fixed - for anyone else who might have this problem in future. I used this Techrepublic article, which boils down to

```
netstat -a -n -o | grep "8080"
```

to find out how to find out which process was using port 8080 and then killed it in Task Manager and then restarted Jenkins and all was well (so far!).

Jenkins won't start: Failed to listen on port 8080

Solution

Problem