Sign in with Microsoft
Sign in or create an account.
Hello,
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Symptoms

Assume that you use the New-OWAVirtualDirectory or New-ECPVirtualdirectory cmdlet to re-create the "owa" or "ECP" virtual directory on a Microsoft Exchange Server 2013 or Microsoft Exchange Server 2016 Mailbox server. In this situation, when users try to access Outlook Web App, Outlook on the Web, or the Exchange Administration Center (EAC), they receive an "Http 404" error code. 

Cause

This issue occurs because an incorrect authentication method is set for the "owa" and "ECP" virtual directories. When you run the New-OWAVirtualDirectory or New-ECPVirtualdirectory cmdlet to create the "owa" or "ECP" virtual directory, the cmdlet incorrectly enables Forms authentication and Basic authentication instead of Windows authentication.

Workaround

To work around this issue, follow these steps.

For the "owa" virtual directory

  1. Open Exchange Management Shell (EMS), and then run the following cmdlet to change the authentication method of the "owa" virtual directory to Windows authentication:

    set-Owavirtualdirectory -identity "E15MBX\owa (Exchange Back End)" -WindowsAuthentication $True -Basicauthentication $false -Formsauthentication $false

  2. Run the following command on both the Client Access and Mailbox servers to restart Internet Information Services (IIS):

    iisreset /noforce

For the "ECP" virtual directory

  1. Start Windows PowerShell.

  2. Type the following commands, and then press Enter after each line:

    Add-PSSnapin *exchange*

    Set-EcpVirtualDirectory -Identity "E15MBX\ecp (Exchange Back End)" -WindowsAuthentication $true -FormsAuthentication $false

  3. Run the following command on both the Client Access and Mailbox servers to restart Internet Information Services (IIS):

    iisreset /noforce

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!

×