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Gr8BrittonBEA's avatar
Gr8BrittonBEA
Copper Contributor
Aug 16, 2022

Maximum number of concurrent shells for the Remote Desktop Services plug-in has been exceeded

Server 2019 Standard (2 each)

When opening Server Manager, it takes quite awhile to read the RDS servers and eventually comes back for the local server with the error:

 

Maximum number of concurrent shells for the Remote Desktop Services plug-in has been exceeded.  Restart Server Manager, and then try again.

 

I have increased the MaxConcurrentUsers to 2147483647, as well as the MaxShellsPerUser just to make sure:

 

On a Server 2012 R2 server, I have both of the 2019 servers in the server list and open the RDS portion of server mgr and do NOT get this error.  It ONLY happens when opening RDS in Server Mgr on the 2019 servers.

 

I have scoured all over the Inter-webs for an answer to no avail.  Anyone have a fix for this?

  • robindevries's avatar
    robindevries
    Copper Contributor

    Gr8BrittonBEA 

    Heyy yawwwl

    I had this issue with my RDS Server. For me, i had recently disabled NTLM (Negotiate) Authentication in my WinRM to only allow safer Auths (mainly Kerberos).
    This had lead to some things not working properly. Sadly, i now had to reenable it *very sad*

    Won't you try the following:
    You can check in powershell which authentications your winrm allows on the affected server. Use chatGPT to figure out how. Frankly, it's a whole process and too much to post here. Maybe you got the same issue?

     

    Cheers

    Beder

  • aafar's avatar
    aafar
    Brass Contributor

    Gr8BrittonBEA also seeing this same issue on multiple new Windows Server 22 RDP installs. Did you ever find a solution?

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