[Forum FAQ] "Unable to connect to the server by using Windows PowerShell Remoting" error while installing RDS roles on Server 2012 R2

Question

When you try to install RDS role on server 2012 R2 using standard deployment, this issue may occur (Figure 1).
“Unable to connect to the server by using Windows PowerShell remoting”.
Figure 1: Unable to connect to the server by using Windows PowerShell remoting
First of all, we need to verify the configurations as it suggested:
1. The server must be available by using Windows PowerShell remotely.
2. The server must be joined to a domain.
3. The server must be running at least Windows Server 2012 R2.
4. The currently logged on user must be a member of the local Administrators group on the server.
5. Remote Desktop Services connections must be enabled by using Group Policy.
In addition, we need to check if the “Windows Remote Management “service is running and related firewall exceptions have been created for WinRM listener.
To enabling PowerShell remoting, we can run this PowerShell command as administrator (Figure 2).
Enable-PSRemoting -Force
Figure 2: Enable PowerShell Remoting
However, if issue persists, we need to check whether it has enough memory to work.
By default, remote shell allots only 150 MB of memory. If we have IIS or SharePoint App pool, 150 MB of memory is not sufficient to perform the remoting task. Therefore, we need to increase
the memory via the PowerShell command below:
Set-Item WSMan:\localhost\Shell\MaxMemoryPerShellMB 1000
Then, you need to restart the server and the issue should be resolved.
You can get more information regarding Remote Troubleshooting by below link:
about_Remote_Troubleshooting
If you need further assistance, welcome to post your questions in the
RDS forum.
Please click to vote if the post helps you. This can be beneficial to other community members reading the thread.

Answer 1

i found another possible reason, this solution worked for me:
http://oyvindnilsen.com/solution-for-powershell-remoting-error-it-cannot-determine-the-content-type-of-the-http-response-from-the-destination-computer/
I tried to set up powershell remoting on a server and kept getting this error:
Enter-PSSession : Connecting to remote server failed with the following error message : The WinRM client cann
ot process the request. It cannot determine the content type of the HTTP response from the destination comput
er. The content type is absent or invalid. For more information, see the about_Remote_Troubleshooting Help to
pic.
After a bit of troubleshooting I discovered that the problem was that the authentication packets was to big (over 16k), this will cause WinRM to reject the request. The reason for authentication packets getting too big can be because the user is member of very
many security groups or in my case because of the SidHistory attribute.
The solution was to increase the MaxFieldLength and MaxRequestBytes keys in the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\HTTP\Parameters
If the keys does not exists you can create them, be sure to use the DWORD type.
I sat MaxFieldLength to DEC value 40000 and MaxRequestBytes to DEC value 32768 and rebooted the server. Problem solved.