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Exchange 2010 - Outlook prompting for password

Hi, for some reason Outlook has started prompting users for a password and automatically populating the username box with username@domain.local

No matter what we do it will not accept the password, I've changed it to username, domain\username, email address but nothing works and the password box comes back each time. The strange thing is emails still continue to send and receive when you cancel the login box.

All the PC's are running the most up to date versions of either Office 2013 or 2016 and Exchange 2010 is also up to date.

Sure it's an authentication setting somewhere in Exchange but I'm struggling to find it.

Many thanks for your help

Adam

M A

Dear Adam,
Please try to change ClientAuthenticationMethod and IISAuthenticationMethods to NTLM and check.

Thanks
MAS

Gavin Reid

ASKER

Hi MAS, sorry where do I change that?

M A

Please use these commands

set-OutlookAnywhere -IISAuthenticationMethods NTLM
set-OutlookAnywhere -ClientAuthenticationMethod NTLM

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Naveen Sharma

Seems like an issue with the settings, check your outlook anywhere settings and change to ntlm as above suggested. https://testconnectivity.microsoft.com/

Also, have you check credential setting in the credential manager?

Open the control panel then click the credential manager.

https://social.technet.microsoft.com/Forums/office/en-US/dff92319-5424-4e26-a1d9-c693b0e87567/microsoft-outlook-2016-keeps-asking-for-a-password?forum=outlook

Gavin Reid

ASKER

Sorry MAS, bit of a newcomer to this side of things, I've run the first command in EMS and it's now asking for Identity...

Ganesh Anand

Check the service connection point URL and internal certificate if it is expired.

Gavin Reid

ASKER

Hi Naveen,

I've tried removing saved entries in Credential Manager, this hasn't helped I'm afraid.
Ganesh, the certificate is valid, not sure how to check the connection point URL I'm afraid...

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Ganesh Anand

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Gavin Reid

ASKER

Many thanks I've followed you instructions and got it working. Regards Adam