New Hybrid Configuration Wizard crashes with error code 0xe0434352

Applies to: Exchange Online


When you run a new Hybrid Configuration Wizard, it crashes and returns exception code 0xe0434352. The detailed event log resembles the following:

Log Name: ApplicationSource: Application ErrorDate: 12/12/2016 7:55:20 PMEvent ID: 1000Task Category: (100)Level: ErrorKeywords: ClassicUser: N/AComputer: Server.contoso.comDescription:Faulting application name: Microsoft.Online.CSE.Hybrid.App.exe, version: 16.0.1539.7, time stamp: 0x5849b79bFaulting module name: KERNELBASE.dll, version: 6.1.7601.23569, time stamp: 0x57f7c0b4Exception code: 0xe0434352Fault offset: 0x000000000001a06dFaulting process id: 0xc6cFaulting application start time: 0x01d254e36c3b2b79Faulting application path: C:\Users\server\AppData\Local\Apps\2.0\VZQBHRCH.9Y2\L5E826PT.VQO\micr..tion_c3bce3770c238a49_0010.0000_06b16895f88ffa1a\Microsoft.Online.CSE.Hybrid.App.exeFaulting module path: C:\Windows\system32\KERNELBASE.dllReport Id: 33604739-c0d7-11e6-a107-0050569c0d00



This issue occurs if the external Exchange Web Services (EWS) URL is not set on any Exchange server.


To resolve this issue, set the external EWS URL. To do this, use one of the following methods.

Note In these methods, replace the CAS_server_name and placeholders with the name of your CAS server and your domain, respectively.

Method 1: Use Exchange Management Shell

Run the following cmdlet in Exchange Management Shell: 

Set-WebServicesVirtualDirectory -Identity "CAS_server_name\EWS (Default Web Site)" -ExternalUrl


Method 2: Use Exchange Admin Center

  1. Sign in to Exchange Admin Center.
  2. Locate Servers -> Virtual directories, select your server by name, and then select type EWS.
  3. In the Default Web Site dialog box, set External URL to

    A screenshot of the Default Web Site page

More Information

Still need help? Go to Microsoft Community or the Exchange TechNet Forums.