Symptoms

Exchange Admin Center failed to open when trying to log in remotely (error 400 is shown). Locally it works fine.

Cause

Access to EAC is automatically disabled by Parallels during package installation because it is a recommendation of Microsoft:

http://download.microsoft.com/download/0/3/5/0357F1C1-8DBC-4CC8-873E-D38E0D0855A0/Multi-Tenancy_and_Hosting_Guidance_For_Exchange_Server_2013.docx (see page 11):

It is recommended to completely disable access to the Exchange Administration Center by modifying the Set-ECPVirtualDirectory –AdminEnabled parameter on all tenant-facing Client Access servers.

Resolution

If you need to enable remote access to EAC for some reasons, steps are as follows:

  1. execute the following command from Exchange Management Shell:

    Get-ECPVirtualDirectory | Set-ECPVirtualDirectory -AdminEnabled $true
  2. restart IIS on CAS servers

Details about Set-ECPVirtualDirectory cmdlets can be found here:

http://technet.microsoft.com/en-us/library/dd297991%28v=exchg.150%29.aspx

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