A Call To Sspi Failed Powershell


Have you ever encountered the frustrating error message “a call to sspi failed” while working with PowerShell? If so, you’re not alone. This cryptic error can be a headache to troubleshoot, but fear not! I’ve delved into this issue and gathered some insights that I’ll be sharing with you in this article.

Understanding the Error

When PowerShell throws the “a call to sspi failed” error, it often indicates an issue with the Security Support Provider Interface (SSPI). SSPI is a Win32 API used by Windows to perform security-related functions, including authentication.

Possible Causes

One common cause of this error is related to network connectivity or authentication issues. It could occur when trying to establish a connection to a remote server using specific authentication methods such as Kerberos or NTLM.

My Experience

While working on a PowerShell script that involved remote server access, I encountered the “a call to sspi failed” error. It took me down a rabbit hole of debugging and troubleshooting to identify the root cause.

Troubleshooting Steps

When faced with this error, it’s essential to methodically work through potential causes. Here are some steps that helped me in resolving this issue:

  1. Check Network Connectivity: Ensure that the server you are trying to connect to is accessible and that there are no network issues impacting the communication.

  2. Review Authentication Settings: Verify the authentication settings in your PowerShell script or command. It’s crucial to ensure that the authentication method being used is supported by the target server.

  3. Verify Credentials: Double-check the credentials being used for authentication. Incorrect or expired credentials can trigger the SSPI error.

  4. Service Principal Name (SPN) Configuration: If you are utilizing Kerberos authentication, ensure that the Service Principal Name (SPN) is correctly configured for the target server.


After meticulously going through the troubleshooting steps, I was able to pinpoint the issue. In my case, it turned out that the SPN for the server was misconfigured, causing the SSPI error during authentication attempts.

Addressing the SPN configuration resolved the “a call to sspi failed” error, and my PowerShell script was able to establish the required connections without any hiccups.


In conclusion, the “a call to sspi failed” error in PowerShell can be a complex puzzle to solve, often rooted in network and authentication intricacies. By carefully analyzing network connectivity, authentication settings, credentials, and SPN configurations, you can effectively troubleshoot and resolve this error, getting your PowerShell scripts back on track.