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This article describes the issue when despite being given the correct credentials, HTTP-based Monitors fail to authenticate websites and returns the following error:
The Remote Server returned an error : (401) Unauthorized
The authentication type used by the website is unsupported by the HTTP-based Monitors.
At the time of this writing, HTTP-based Monitors support the following authentication types:
The following authentication types are unsupported:
Enable one of the supported authentication types on the website being monitored.