How to fix "The WinRM Shell client cannot process the request. One of the parameters required for the WSManCreateShell function is null or zero."

Description

This error occurs when a client computer attempts to initiate a Windows Remote Management (WinRM) or PowerShell remoting session, but the local environment lacks the necessary variables, or the underlying configuration required to establish the shell structure is invalid.

The primary cause is typically a missing, corrupted, or blank environment variable on the local machine—most commonly the USERPROFILE or TEMP/TMP environment variables. When the WinRM infrastructure initializes the WSManCreateShell function, it checks these environment variables to establish the session path. If they are null, zero-length, or pointing to an inaccessible location, the initialization fails immediately and throws this specific error. It can also happen if the WinRM client configuration itself is misconfigured or if there is a conflict in the PowerShell execution policy.

Step-by-Step Fix

Follow these steps in order to resolve the issue.

Step 1: Verify and Fix Environment Variables

Since a missing or incorrect USERPROFILE variable is the most common trigger, you must ensure it points to your correct user folder.

1. Press Win + R on your keyboard to open the Run dialog box.
2. Type sysdm.cpl and press Enter to open System Properties.
3. Navigate to the Advanced tab.
4. Click on the Environment Variables... button at the bottom.
5. In the User variables section (top list), look for USERPROFILE.
   • If it does not exist, click New.... Set the Variable name to USERPROFILE and the Variable value to C:\Users\YourUsername (replace YourUsername with your actual Windows account name).
   • If it exists, click Edit... and ensure the path is exactly C:\Users\YourUsername without any trailing spaces or quotes.
6. Check the TEMP and TMP variables in the same window. Ensure they point to a valid folder (usually %USERPROFILE%\AppData\Local\Temp).
7. Click OK on all windows to save the changes.
8. Restart your computer for the system to apply the new environment variables globally.

Step 2: Restart the WinRM Service

Refreshing the Windows Remote Management service will clear any stuck configurations or temporary state errors.

1. Press the Windows Key, type cmd, right-click on Command Prompt, and select Run as administrator.
2. Type the following command to stop the service and press Enter:

   net stop winrm

3. Type the following command to start the service again and press Enter:

   net start winrm

Step 3: Repair the WinRM Configuration

Resetting the WinRM settings to their default secure state fixes hidden parameter corruptions.

1. Open Command Prompt as an administrator (as done in Step 2).
2. Type the following command to automatically configure and repair WinRM parameters, then press Enter:

   winrm quickconfig

3. If prompted to make changes or enable the service, type y (Yes) and press Enter.

Step 4: Run PowerShell with Default Profiles Bypass

Sometimes local custom PowerShell profiles pass null arguments to the connection functions. You can test and bypass this behavior.

1. Right-click the Start button and select Terminal (Admin) or PowerShell (Admin).
2. If you are running a script or a command that triggers the error, execute PowerShell while explicitly ignoring local profiles by running:

   powershell.exe -NoProfile

3. Try executing your remote command within this clean PowerShell instance to see if the issue is resolved.