If your Exchange 2007 or Exchange 2010 environment includes more that one CAS server, it’s sometimes helpful to know which one a client is connecting to. Environments with more that one CAS usually use some form of hardware or software load balancing, making it difficult to troubleshoot OWA issues.
A relatively easy way to do this is to brand each CAS server’s OWA logon page with the server name. This way, end-users are able to provide the server name if they run into problems.
For Exchange 2007, navigate to C:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\auth folder and open the logon.aspx file using Notepad.
Add either of the two edits shown in the screenshot below:
Adding the server name as highlighted above in blue will add the server name “invisibly” below the logon screen. To view the server name, click anywhere on the screen and press CTRL-A to select all. You can then see the server name, as shown below:
For Exchange 2010, navigate to the C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\auth folder and open the logon.aspx file using Notepad.
Add the server name, as shown in the screenshot below:
This will add the server name to the logon screen, as shown below: