Windows Extended Protection (WEP) has been added to all Exchange infrastructure to further improve the security and follow the guidelines provided by Microsoft. As a result, there have been cases where the password prompt is occuring as some Anti-Virus scanners checks Outlook.

The Process

Step 1: Please ensure that all updates are installed for both: Windows OS, and Outlook client (or Office suite).

Step 2: Is Anti-virus currently in use? If it is, temporarily disable it, or add Outlook client to allow /exceptions list for any network traffic to not be scanned with AV. Known issue is with Kaspersky.

How to bypass in Kaspersky: 

Add Exchange proxy address(es) into exclusions in Kaspersky. 

Kaspersky > Settings > General Settings > Threats and Exclusions > Specify Trusted Applications >  Add > C:\Program Files\Microsoft Office\root\Office16\OUTLOOK.EXE (Path may vary based on outlook version)

Also, ensure that DO NOT SCAN ENCRYPTED TRAFFIC is checked

Turn off the Web Anti-Virus setting (if this option is not showing you may skip this step)

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            Outlook should then prompt for a password, however once you enter it

Step 3: If Outlook still does not connect, another possible solution is to apply Registry fix: on the clients computer, that gets constant password prompts when opening Outlook, check registry:



* look for a LmCompatibilityLevel --> If there is no entry for it, create one by following the below steps:


Right click > New > DWord (32-bit) Value
Value name = LmCompatibilityLevel
set value = 3


Restart machine. 


You can change the value of the registry fix to either 3,4,5 and these options that can have varying degrees of success. 

Step 4: If issues still persist, please contact support at