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When I connect to my Windows 10 machine from my Mac via Microsoft Remote Desktop client v10 or from Windows I'm getting an error: Your session ended because of an error. If this keeps happening, contact your network administrator for assistance. Error code: 0x4

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  • duplicating the "bad connection" works sometimes
    – marstone
    Sep 28, 2021 at 9:44

2 Answers 2

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I reported this issue to MS via their Report Issue form on Mac Remote Desktop client and got the following response:

Set this key to a high value, like 10,000 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server

MaxOutstandingConnections

DWORD

Once I followed these recommendations the problem stopped.

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  • This looked like the problem for me. Server wouldn't let me connect via RDC, error disconnect 4. Server was up and operational other than that. I was locked out of remotely managing it. Thankfully I had IPMI access to the server over the datacenter VPN. Others, may not be so lucky..
    – ScottN
    Jul 8, 2020 at 17:20
  • For me, ended up that I was inadvertently running TripMode which was blocking internet for RDC. Either disabling TripMode or adding Microsoft Remote Desktop to the allowed apps did the trick.
    – Brian Hogg
    Jan 2, 2022 at 20:37
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Definitely, a Microsoft issue with RDPv10. Got same issue. Thanks for recommendation shared. Also, reboot of the remote machine helps.

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    Yes, reboot helps, but in my case it was quite inconvenient as I didn't have direct access to this machine, so each reboot caused me huge loss of time.
    – mikryz
    Mar 28, 2019 at 5:36

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