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Event ID: 1016 Source: TermServSessDir

The session directory service denied the rpc call from an unauthorized computer.
As per Microsoft: "The Session Directory service will not accept any connections from servers that do not have their domain computer account included in this local group. By default, when the Session Directory Service creates the "Session Directory Computers" group, it is empty—therefore no computers will have access to the Session Directory unless they are explicitly granted access". See "Session Directory and Load Balancing Using Terminal Server" to download the original document.
Make sure to add the terminal server which has the IP mentioned in the message to the "Session Directory Computers" Security Group in Active Directory.

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