Check Exchange 2010 Internal and External URL configuration
A quick list of commands to show the URL configuration, remember use the Exchange PowerShell commands:
Get-ActiveSyncVirtualDirectory | ft server,*lur* -AutoSize
Get-AutodiscoverVirtualDirectory | ft server,*lur* -AutoSize
Get-ClientAccessServer | ft name, *lur* -AutoSize
Get-EcpVirtualDirectory | ft server,*lur* -AutoSize
Get-OabVirtualDirectory | ft server,*lur* -AutoSize
Get-OwaVirtualDirectory | ft server,*lur* -AutoSize
Get-WebServicesVirtualDirectory | ft server,*lur* –AutoSize
The AutoSize parameter allows you to tell PowerShell that you want the formatter to automatically size the table columns, showing as much data as possible.