Intermittent Http Server Error 500

Details: -

Issue - The application throws Http Server Error 500 intermittently.

Web application details- J2EE(Struts) with SQL Server back end.
Server - BEA Weblogic Server 8.1 SP6

Can someone help in troublshooting the following error? Any leads/ideas? Please let me know if you need more details.

Thanks
webbie79

Error in the server log: -
java.net.SocketTimeoutException: Read timed out
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:129)
      at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:170)
      at weblogic.servlet.internal.ServletInputStreamImpl.read(ServletInputStreamImpl.java:180)
      at weblogic.servlet.internal.ServletRequestImpl.mergePostParams(ServletRequestImpl.java:1339)
      at weblogic.servlet.internal.ServletRequestImpl.parseQueryParams(ServletRequestImpl.java:1206)
      at weblogic.servlet.internal.ServletRequestImpl.getParameter(ServletRequestImpl.java:1409)
      at weblogic.servlet.internal.ServletRequestImpl.getParameter(ServletRequestImpl.java:1395)
      at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:118)
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
      at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7053)
      at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
      at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
      at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
      at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
      at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
      at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
--------------- nested within: ------------------
weblogic.utils.NestedRuntimeException: Cannot parse POST parameters of request: '/eWO/createWorkOrder.do' - with nested exception:
[java.net.SocketTimeoutException: Read timed out]
      at weblogic.servlet.internal.ServletRequestImpl.mergePostParams(ServletRequestImpl.java:1364)
      at weblogic.servlet.internal.ServletRequestImpl.parseQueryParams(ServletRequestImpl.java:1206)
      at weblogic.servlet.internal.ServletRequestImpl.getParameter(ServletRequestImpl.java:1409)
      at weblogic.servlet.internal.ServletRequestImpl.getParameter(ServletRequestImpl.java:1395)
      at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:118)
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
      at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7053)
      at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
      at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
      at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
      at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
      at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
      at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)