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Remote desktop logins take much longer than usual when ArcGIS Server is running on Windows Server 2012, 2012 R2, or 2016. The login period can take anywhere from half a minute to several minutes long.
ArcGIS Server runs many processes as a service (ArcSOCs), and these processes trigger a defect in Microsoft Windows 2012, 2012 R2, or 2016.
Depending on the operating system, install the following security update from the Microsoft Support website: