Hello,
Thank you for posting in the Microsoft Community forum.
I'm sorry but based on my research, nothing in RDCMan is specifically designed to reset a stuck connection to a proxy server. If RDCMan does not respond well to a manual disconnection, you might consider restarting the specific RDP process associated with that server using Windows Task Manager. This forces the RDCMan to try to reconnect and triggers the MFA prompt again. Additionally, you can wait for the MFA session to time out. The system may reset the connection itself after a period of time, allowing you to try to reconnect.
Reference:
Remote Desktop Connection Manager - Sysinternals | Microsoft Learn
Best regards
Jacen
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