Monitor fails with 401 Error when connecting monitor to Sharepoint site

Document ID : KB000009081
Last Modified Date : 14/02/2018
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Issue:

When setting up a monitor to connect to a sharepoint hosted site, it always fails with error "401 - Unauthorized". This happens with any monitor tried - http, https, fullpage, etc.

Environment:
ASM http monitor run against a sharepoint site
Resolution:

Microsoft NTLM authentication may be needed for sharepoint sites. To activate this, modify the monitor, click Advanced, and near the bottom click the "Use NTLM" checkbox, then click the green Save button.  After that, your monitor will be tested.  Once the test comes back, be sure to scroll down and click the green Activate button.