Repeatedly prompted to enter your credentials when trying to connect to an Exchange mailbox by using

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Outlook 2007 keeps on asking credentials when trying to connect to an Exchange mailbox.We have exchange server 2007 running in our environment.I have reviewed the support articles from microsoft KB 927612,But it is for exchange 2003.Also i have reviwed CAS server internal url settings,so for it is not resolved.

Please help me to troubleshoot the problem

Jennifer Zhan


If you are using Windows Vista or Windows 7, please try following method:

Open up windows explorer and then paste the following text into the address bar, which should bring you to a folder with a single folder inside with a really long name.


What you"ll need to do is just rename that folder to something else then re-open Outlook and type in your password.

If it not works or you are not using Win7 or Vista, you can try to add this registry entry.

1. Click Start, click Run, type regedit, and then click OK.

2. Locate and then right-click the following registry subkey:


3. Point to New, and then click DWORD Value.

4. Type PromptForCredentials as the name of the new registry entry, and then press ENTER.

5. Double-click the PromptForCredentials registry entry, and then type one of the following values in the Value data dialog box:


Note In this case, cached credentials will be used.
Note In this case, users cannot use cached credentials. Users are always prompt to provide a user name and password.

6. Click OK.

In addition, you can try suggestions provided here:


Hi Jennifer,

Thanks for your suggestion,

This problem is occuring in windows XP too and also we have more than 5000 assets,it is not possible to change the values as you said in every machines.

Is there any other fix you can suggest ?

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