When trying to access the ECP , it takes you to the OWA page and after providing your username and password it gives you a blank “HTTP 400 Error” page.


You missed up your authentications methods my friend


make sure that the authentication methods used by OWA and ECP are matching this is done by running the following

> Get-owavirtualdirectory | fl

make sure that you using “Form based Authentication” and “Basic Authentication”


do the same with ECP using the following command line

> Get-ECPVirtualDirectory | fl


If not then you just need to reconfigure the Authentications on both Virtual Directories, DONNOT use IIS use Exchange Management Shell.

For owa use the following

>Set-owavirtualdirectory -identity “owa <Default Web site>” -FormsAuthentication:$true

use the same also for ECP

>Set-ecpvirtualdirectory -identity “ecp <Default Web site>” -FormsAuthentication:$true

then restart your iis services using the following


once finished try to access your ECP page again and it should work now