Outlook what is the Kerberos authentication prompts a user for his logon

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Just curious as to why an Outlook ’03 client with the logon security set to Kerberos authentication prompts a user for his logon details when opening MS Outlook. Anyone?

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Best Answer by Mathew Stone
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Answered By 0 points N/A #116263

Outlook what is the Kerberos authentication prompts a user for his logon

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That happens possibly because the Outlook client is connecting with RPC over HTTP instead of using straight RPC connection, and that will happen in the case whereby you are using the default settings. So you will need to check the settings as follows:

  • You will need to close outlook first by clicking on exit.
  • And then you will click on Start and then open the Control Panel.
  • You will need to switch the control panel to Classic View.
  • And then you will double-click the Mail control panel, and then click on E-mail Accounts.
  • You will then Click Next.
  • Select the Microsoft Exchange Server and the click change.
  • Next you will need to click the More Settings button, and then click the Connection tab.
  • And then you will go to the Exchange over the Internet section and from there check that "Connect to my Exchange mailbox using HTTP is NOT checked.

-Mathew Stone

 

Answered By 0 points N/A #116264

Outlook what is the Kerberos authentication prompts a user for his logon

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You may need to check a few things as per the list below:

Check if there are any Kerberos errors on the Exchange server or active directory

It may be caused by an authentication issue on the autodiscover virtual directory in IIS. You may found information regarding this on this link http://technet.microsoft.com/en-us/library/bb201695.aspx

You may want to check the outlook profiles of the users who are having the issues. If they are connecting and using ‘Cache Exchange mode’ and connects to the exchange server using HTTP. You may also check authentication settings as Outlook can be configured to always request for authentication.

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