There are instances that the Application Pool unexpectedly stops and does not restart automatically. As a result, you will get the 503: Service Unavailable error.

To resolve the issue, do either of the following:

Option I:

1. Click Start > Run.
2. Enter "cmd" and click OK.
3. From the command prompt, enter the following command to start the application pool: 
   %windir%\system32\inetsrv\appcmd start apppool OsceAppPool

Option II:

1. Open Internet Information Services (IIS) Manager.
2. Go to Application Pool.
3. Start OsceAppPool.
4. Click Advanced Settings.
   

   

5. Make sure that Start Automatically is set to True.
   

   

If the procedures fail, send the following to Trend Micro Technical Support:

• CDT log generated on the WFBS server
• Copy of the IIS log
• Copy of %windir%\system32\LogFiles\HTTPERR\httperrx.log
• If you are using IIS 7: ..\Inetpub\wwwroot\logfiles\W3SVCnumber\exyymmdd.log

where:

• "number" = the site ID for the OfficeScan website
• "yymmdd" = the date the log file is created or modified.