What is going on with our Teamcity agent?

We're running 5.1.4, nothing has changed for the project configuration but several of our builds are now hanging. The only way to stop them is to issue a shutdown command and then the `./agent.sh stop kill` command to actually kill the agents. The only error I see is in teamcity-build.log below, any ideas?


[2011-05-16 17:22:44,794] err - jetbrains.buildServer.xmlrpc.RemoteCallException: Call http://localhost:9090/RPC2 buildAgent.log: java.io.IOException: Server returned HTTP response code: 400 for URL: http://localhost:9090/RPC2
[2011-05-16 17:22:44,794] err -     at jetbrains.buildServer.xmlrpc.AbstractXmlRpcTarget.call(AbstractXmlRpcTarget.java:82)
[2011-05-16 17:22:44,794] err -     at jetbrains.buildServer.agent.impl.XmlRpcAgentLogListener$1.invoke(XmlRpcAgentLogListener.java:55)
[2011-05-16 17:22:44,794] err -     at jetbrains.buildServer.agent.impl.XmlRpcAgentLogListener.doSendRequest(XmlRpcAgentLogListener.java:102)
[2011-05-16 17:22:44,794] err -     at jetbrains.buildServer.agent.impl.XmlRpcAgentLogListener.log(XmlRpcAgentLogListener.java:53)
[2011-05-16 17:22:45,793] err -     at jetbrains.buildServer.agent.impl.ServerLogger.log(ServerLogger.java:62)
[2011-05-16 17:22:45,794] err -     at jetbrains.buildServer.agent.ServerLoggerFacade.log(ServerLoggerFacade.java:48)
[2011-05-16 17:22:45,794] err -     at jetbrains.buildServer.agent.BaseServerLoggerFacade.logMessage(BaseServerLoggerFacade.java:158)
[2011-05-16 17:22:45,794] err -     at jetbrains.buildServer.agent.BaseServerLoggerFacade.activityStarted(BaseServerLoggerFacade.java:80)
[2011-05-16 17:22:45,794] err -     at jetbrains.buildServer.agent.ant.AgentBuildListener.taskStarted(AgentBuildListener.java:150)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.Project.fireTaskStarted(Project.java:2131)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.Task.perform(Task.java:344)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.Target.execute(Target.java:357)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:131)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.taskdefs.ImportTask.execute(ImportTask.java:146)
[2011-05-16 17:22:45,794] err -     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[2011-05-16 17:22:45,794] err -     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[2011-05-16 17:22:45,794] err -     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[2011-05-16 17:22:45,794] err -     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[2011-05-16 17:22:46,797] err -     at java.lang.reflect.Method.invoke(Method.java:597)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.Task.perform(Task.java:348)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.Target.execute(Target.java:357)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:131)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.taskdefs.ImportTask.execute(ImportTask.java:146)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[2011-05-16 17:22:46,798] err -     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[2011-05-16 17:22:46,798] err -     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[2011-05-16 17:22:46,798] err -     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[2011-05-16 17:22:46,798] err -     at java.lang.reflect.Method.invoke(Method.java:597)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.Task.perform(Task.java:348)
[2011-05-16 17:22:46,798] err -     at org.apache.tools.ant.Target.execute(Target.java:357)
[2011-05-16 17:22:47,805] err -     at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:142)
[2011-05-16 17:22:47,806] err -     at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:93)
[2011-05-16 17:22:47,806] err -     at org.apache.tools.ant.Main.runBuild(Main.java:743)
[2011-05-16 17:22:47,806] err -     at org.apache.tools.ant.Main.startAnt(Main.java:217)
[2011-05-16 17:22:47,806] err -     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
[2011-05-16 17:22:47,806] err -     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
[2011-05-16 17:22:47,806] err - Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: http://localhost:9090/RPC2
[2011-05-16 17:22:47,806] err -     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1436)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.TCDefaultXmlRpcTransport.sendXmlRpc(TCDefaultXmlRpcTransport.java:91)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.XmlRpcClientWorker.execute(XmlRpcClientWorker.java:72)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.TCXmlRpcClient$1.execute(TCXmlRpcClient.java:87)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:194)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:185)
[2011-05-16 17:22:47,806] err -     at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:178)