Apache is still running, but the webpage cannot be opened.

Apache is still running, but the web page cannot be opened. could you please help me? I installed a php environment on the server in the past few days. the server system is server2003, and sometimes the website will suddenly fail to be opened, but apache is still running and can only restart the apache service? please help me to see what the problem is. the apache error code is posted & nbsp; XMLcodeStartingtheApach apache is still running, but the webpage cannot be opened.
In the past few days, I installed a php environment on the server. the server system is server2003, and sometimes the website cannot be opened. However, apache is still running and can only be restarted. please help me. what is the problem? post the apache error code

XML code

  Starting the Apache2.2 serviceThe Apache2.2 service is running.rmine the server's fully qualified domain name, using 192.168.1.182 for ServerName[Sun Nov 20 02:56:33 2011] [notice] Apache/2.2.9 (Win32) configured -- resuming normal operations[Sun Nov 20 02:56:33 2011] [notice] Server built: Jun 13 2008 04:04:59[Sun Nov 20 02:56:33 2011] [notice] Parent: Created child process 2236httpd.exe: Could not reliably determine the server's fully qualified domain name, using 192.168.1.182 for ServerNamehttpd.exe: Could not reliably determine the server's fully qualified domain name, using 192.168.1.182 for ServerName[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Child process is running[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Acquired the start mutex.[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Starting 64 worker threads.[Sun Nov 20 02:56:33 2011] [notice] Child 2236: Starting thread to listen on port 80.[Sun Nov 20 02:56:58 2011] [notice] Parent: Received shutdown signal -- Shutting down the server.[Sun Nov 20 02:56:58 2011] [notice] Child 2236: Exit event signaled. Child process is ending.[Sun Nov 20 02:56:59 2011] [notice] Child 2236: Released the start mutex[Sun Nov 20 02:57:00 2011] [notice] Child 2236: All worker threads have exited.[Sun Nov 20 02:57:00 2011] [notice] Child 2236: Child process is exiting[Sun Nov 20 02:57:00 2011] [notice] Parent: Child process exited successfully.

------ Solution --------------------
When the log content of error. log cannot be opened, check whether the system process apache has consumed a large amount of memory.