急~在线等待~一个关于Connection timed out的问题?

我用struts+spring+ibat做了个考评系统~
怎么管理员登陆以后进内页点下拉菜单报这样一个错呢???
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception java.net.ConnectException: Connection timed out: connect
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
java.net.Socket.connect(Socket.java:452)
java.net.Socket.connect(Socket.java:402)
java.net.Socket.<init>(Socket.java:309)
java.net.Socket.<init>(Socket.java:184)
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:79)
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:121)
org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
com.whicss.business.platform.sso.util.SSOUtils.httpRequest(SSOUtils.java:164)
com.whicss.business.platform.sso.util.SSOUtils.redirectToAuthenticate(SSOUtils.java:178)
com.whicss.business.platform.sso.filter.SSOAgentFilter.doFilter(SSOAgentFilter.java:69)
com.whcyit.framework.filter.EncodingFilter.doFilter(EncodingFilter.java:53)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.0.28