Skip to content

How to Fix Mac Microsoft Remote Desktop RDP Error Code 0x4

Website Developer Sydney

How to Fix Mac Microsoft Remote Desktop RDP Error Code 0x4

Screen Shot 2020 09 25 at 02 41 16

You have a Mac Computer and are running Microsoft Desktop (RDP) throws an Error code: 0x4 just randomly when you try to connect to a computer you have configured for connection.

For us, this problem just randomly started this year after Microsoft updated their RDP software. “Go Microsoft”

We have searched the web, and noticed that the suggestions to Reboot the computer, or restart the RDP software, or both. Do not appear to reliably work. Although we did have some luck with this.

Another suggestion was to copy or recreate the connection in RDP. Again, only limited success with this solution.

Screen Shot 2020 09 25 at 02 48 09

The Fix for 0x4 Errors on Mac RDP Remote Desktop Connection

For us the solution came when we went into the system preferences of the Remote Desktop Connection

Screen Shot 2020 09 25 at 02 49 42

And you will notice the default preferences look something like this.

Screen Shot 2020 09 25 at 02 49 55

We simply unticked the “Use hardware acceleration when possible” check box.

Screen Shot 2020 09 25 at 02 50 08

That’s it. After doing this you should notice that it can fixe in some cases the Mac RDP not connecting with 0x4 Errors.


We have found that the errors can reoccur, which is super frustrating. So there are a few other tips that we have found can assist.


It’s odd, but sometime rebooting the computer that is making the connection, and help in eliminating the 0x4 error.

Duplicate the Connection

If you right click / or Two finger click on the connection, and select Duplicate – Then use the duplicated connection, sometimes that can allow you to connect.

Screen Shot 2021 05 05 at 07 57 54

Try Again

When all else has failed, trying to connect from the connection multiple times can also sometimes work after multiple attempts.

Alternating the Attempts

Lastly, trying the original connection, or alternating between the original, then the newly duplicated connection (in the point above) can also help.


Basically we know these are not solutions, but we have found that they definitely can assist in helping to get the connecting going and avoiding the 0x4 error. Hope it helps, and if you find anything else that eliminates or reduces the error, please chime in.


32 thoughts on “How to Fix Mac Microsoft Remote Desktop RDP Error Code 0x4”

    1. InteractiveWebs Team

      I found it worked for a time then did not. Thanks for the feedback. Something else I tried was to right click on the connection listing and create a copy of the connection. A duplicate, then use this to connect. I have found that this does work. Annoying how MS continually unimproved things!

  1. I unclicked “Help improve remote desktop” as on the screenshot and now it’s working. So strange…

    1. InteractiveWebs Team

      Yeah… know what you mean. It worked for me for a bit, then stopped. Found myself having to at times “make a copy” of a connection and use the copy rather than the original connection to connect. Then at times I found only a reboot wold work.
      I really hate how Microsoft unimprove thing given enough time!

  2. I hope this may help others. I found that the problem was on the remote itself, a machine running Ubuntu/Linux. I did an “ssh” to the remote and restarted the xrdp deamon (something like “sudo /etc/init.d/xrdp restart”). After this, everything started working normally (notice that nothing was changed on the “preferences” settings).

    1. InteractiveWebs Team

      Not sure this is the problem for most people, as they are connecting to Windows systems.

  3. Same here, error 0x4. No amount of clicking, unclicking will allow Mac to connect. I can connect RDP using an old Windows 7 unit.

  4. This has been going on over several versions. The settings file isn’t read correctly and making a change re-writes it. Sometimes that is enough, other times you have to wait a few minutes after making a change before RD decides it is OK. It has absolutely nothing to do with communicating with the server.

    Please join me in pestering Microsoft to fix this! Click on “Help -> Report an issue”.

  5. it works on MAC as desired, but please to kill Microsoft Remote Desktop app on your mac after turning off hardware acceleration

  6. I had the same problem with after upgrading to remote desk top 10.6.4. I solved my problem by restoring back to 10.5.2 from Time Machine!

  7. I was experience the same problem and none of the solutions listed worked. I’m running Big Sur 11.2.3 and recently updated to Microsoft Remote Desktop version 10.6.4. I restored to version 10.5.2 and I’m back in. Nice going developers. Way to test your updates!

    1. Any chance you can share out v10.5.2, I’m in the same boat and have only just configured Time Machine auto backups

  8. I have the same issue. Trying to reconnect multiple times always “solves” the issue… i have to try about 10 times until it connects. Very frustrating.

  9. Debbie Sutherland

    After two days of receiving the error 0x4 on both of my Macs and my iPad and iPhone. It finally began working today. Very frustrating! I always try rebooting and clicking multiple times and that has worked in the past but not this time. Next time I will try going into preferences and unchecking some of the suggested options.

  10. I went through the same issues with my iMac and Mac Book Air both running macOS 10.15.7 and RDP 10.6.6
    I now have a reliable connection on both machines.
    From “Window”, “Connection Centre”, right click the PC connection and in the “General” tab ensure that the box under “Gateway” has the tick removed “Bypass for local addresses”.

  11. Tip: please check if your remote PC is on at all. In my case some simply pulled the plug so my Laptop switched off a few hours later.

  12. I may have found the solution to this issue:

    In the registry there is not MaxOutstandingConnections DWORD. You can add one and give it a number like 10000.

    Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\MaxOutstandingConnections

    I think what’s happening is because this is missing it’s blocking any more connections temporarily.

    1. Just not that this is the server side. There is no relation to the client side as this is a server issue.

  13. Marcio Marinho

    Best solution, I found is to quickly close the error and double click to open it again. Does not solve the initial issue, but it does connect the second time.

    Hope it works for other people, this was super annoying!

    1. Actually the close quickly has worked for me too on a few occasions. Crappy solution, but we are working with Microsoft products.

    1. InteractiveWebs Team

      You know… so am I at times. Sometimes a reboot, sometime just waiting, some of the things here help but not 100%.

  14. I’m getting this error when I try to connect to an azure VM from my local wifi.
    If I connect using any other network (5G, work network, public networks) the connection will be successful.

Leave a Reply

Your email address will not be published. Required fields are marked *