Unauthorized Access" error in ENM 8.2 or ENM 8.3

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Issue
When opening "ENM Configuration" or "Monitoring and diagnostics" for ENM 8.2 or ENM 8.3, the webpage opens with an error "Unauthorized Access"

Product Line
Event Notification Module 8.2

Event Notification Module 8.3

Environment
Internet Explorer
Google Chrome

Cause 1
If it's a new installation, a restart on the server has not been performed.

Cause 2
The lodged on Windows User has not been added to the 3 ENM Windows groups namely:

i) ENMAdmin
ii) ENMControl
iii) ENMUser

access required
Cause 3
"Anonymous Authentication" is activated in Sites "ENMConfig" and "MonDiagSpa"

Resolution 1
If ENM has just been installed, perform a system restart on the server. If a restart is not possible, log off the current Windows user and log back in.

Resolution 2
i) Open "Computer Management" by either right-clicking on My Computer and selecting Manage OR navigating to the control panel-->Administrative Tools-->Computer Management.
ii) Locate Local Users and Groups under System Tools and open Groups.
iii) Open groups "ENMAdmin", "ENMControl" and "ENMUser" and add the logged-in Windows user to all three groups.

Resolution 3
i) Open IIS manager by going to run and typing "inetmgr" OR navigating to the control panel-->Administrative Tools-->Internet Information Services Manager.
ii) From the left side of the pane, open Sites and locate websites named "ENMConfig" and "MonDiagSpa".
iii) Under each of these websites, open "Authentication" from within IIS
iv) If "Anonymous Authentication" is activated, deactivate it from the Actions tab on the right.