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ERROR_CTX_SESSION_IN_USE
ERROR_CTX_SESSION_IN_USE means the account already has a session on the target computer and the current policy or session type does not permit the requested additional logon. It is not necessarily a licensing error.
What to check
- List current and disconnected sessions for the account before attempting another connection.
- Check the effective policy for restricting users to a single session and any application-specific session constraints.
- Reconnect to the existing session where appropriate instead of creating another one.
quser /server:rd-session-host
Microsoft: Remote Desktop Services system error codes
Microsoft: qwinsta / query session
Microsoft: Remote Desktop Services command reference
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