hudson "often" fails to build maven projects. it's not failing always, but about 80% of the builds. It seems that maven can't be started.

Gestartet durch Benutzer anonymous
Updating http://XXXXX/XXXXX/trunk/XXXXX
At revision NNN
no change for http://XXXXX/XXXXX/trunk/XXXXX since the previous build
Parsing POMs
[XXXXX-resources] $ C:\Programme\Java\jdk1.6.0_21/bin/java -cp c:\java\.hudson\plugins\maven-plugin\WEB-INF\lib\maven-agent-1.374.jar;C:\Programme\Apache\apache-maven-2.2.1\boot\classworlds-1.1.jar hudson.maven.agent.Main C:\Programme\Apache\apache-maven-2.2.1 "C:\Programme\Apache\Tomcat 6.0\webapps\hudson\WEB-INF\lib\remoting-1.374.jar" c:\java\.hudson\plugins\maven-plugin\WEB-INF\lib\maven-interceptor-1.374.jar 80 c:\java\.hudson\plugins\maven-plugin\WEB-INF\lib\maven2.1-interceptor-1.2.jar
Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:189)
at hudson.maven.agent.Main.main(Main.java:119)
at hudson.maven.agent.Main.main(Main.java:62)
ERROR: Failed to launch Maven. Exit code = 1
Finished: FAILURE