The following video demonstrates this solution:

Below are the steps to redirect the Control-M Self Service or Batch Impact Manager (BIM) login page to a customized HTTP 404 Error webpage informing users of maintainance window:

1. Create or copy attached 404.html to the following Control-M/EM directories
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\ROOT
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\SelfService
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\bim
    For example, C:\Program Files\BMC Software\Control-M EM 8.0.00\Default\emweb\tomcat\webapps\SelfService

2. Navigate to  <Control-M EM Home>\Default\emweb\tomcat\conf directory
   For example, C:\Program Files\BMC Software\Control-M EM 8.0.00\Default\emweb\tomcat\conf\
   
3. Add the following to the bottom of the web.xml file just before the the </web-app> line.
   For example, C:\Program Files\BMC Software\Control-M EM 8.0.00\Default\emweb\tomcat\conf\web.xml
   
   <?xml version="1.0" encoding="ISO-8859-1"?>
   ...
   ...
   <error-page>
     <error-code>404</error-code>
     <location>/404.html</location>
   </error-page>
</web-app>

4. Rename index.htm to 0index.htm under the following directory:
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\ROOT
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\SelfService
   - <Control-M EM Home>\Default\emweb\tomcat\webapps\bim
   For example, rename C:\Program Files\BMC Software\Control-M EM 8.0.00\Default\emweb\tomcat\webapps\SelfService\index.htm to 0index.htm

5. Launch the Internet Browser and enter some error Web Page.
   For example:
   Enter Control-M for Self Service Webpage which is not available during maintenance: http://hostname:18080/SelfService/
   Or an wrong Control-M Web Server webpage: http://<hostname>:18080/SelfService/Error

6. Customized "HTTP Status 404" Page will be displayed
   For example, 'Gone fishing' maintainance page displayed

Additional Information:
To restore Control-M Web Server Self Service or Batch Impact Manager Login webpage after maintainance
- Simply rename 0index.htm back to index.htm on step 3 above.
- Clearing browser cache may be required to display the Self Service login page.