Every few restarts (via clicking the restart button in the UI), Hudson does not actually go down.

Today I got this message in hudson.out.log (should be .err.log?):

[Winstone 2010/12/16 08:57:20] - Error during AJP13 listener init or shutdown
java.net.BindException: Address already in use: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.<init>(Unknown Source)
at java.net.ServerSocket.<init>(Unknown Source)
at winstone.ajp13.Ajp13Listener.run(Ajp13Listener.java:99)
at java.lang.Thread.run(Unknown Source)

[Winstone 2010/12/16 08:57:20] - Error during HTTP listener init or shutdown
java.net.BindException: Address already in use: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.bind(Unknown Source)
at java.net.ServerSocket.<init>(Unknown Source)
at java.net.ServerSocket.<init>(Unknown Source)
at winstone.HttpListener.getServerSocket(HttpListener.java:102)
at winstone.HttpListener.run(HttpListener.java:116)
at java.lang.Thread.run(Unknown Source)

If I stop the Hudson service and try starting it manually, it won't come back up. The only way to fix it is to kill Java.exe.