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Sure, it's a known issue. Checkout https://discussions.citrix.com/topic/408707-rdp-proxy-with-windows-10-2004 Workaround is: Microsoft took some debug traces and got their developers involved. there's a patch coming out in june that fixes it. there's a registry key workaround: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Terminal Server Client SendCorrelationId = 0 type dword

Thanks Julian, I will test that and see if it helps