Redistributable STS (RSTS) is a third-party authentication component that you can use as an alternative to the default IIS Windows authentication, when logging in to the Active Roles Web Interface.
To install the RSTS application, follow the steps.
Prerequisites
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In Windows, open Local Security Policy and navigate to Security Settings > Local Policies > User Rights Assignment to add the domain user(s) to the Act as part of the operating system policy.
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Make sure that the User Logon Name and the UPN Suffix is set for the domain user(s). Example: administrator@ars1.net.
Installing Redistributable STS (RSTS)