.NET Runtime version 2.0.50727.8813 - Fatal Execution Engine Error (66E70AD6) (80131506)

Bandith Khorn 21 Reputation points

I am running Windows Server 2021 r2 and install Microsoft SQL Server 2008 r2 but when I open SQL Server Management Studio, it is and stop responding.
I have done some research and it is related to the .Net Runtime. The error message " .NET Runtime version 2.0.50727.8813 - Fatal Execution Engine Error (66E70AD6) (80131506)

Is there anyone who has advice for me, please?
Thank you,

  • Bandith
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  1. YufeiShao-msft 7,076 Reputation points

    Hi @Anonymous ,

    It seems to be more about .NET and windows aspect, I just can give you some suggestion, perhaps you should check the error log to see the exact error description and specific fault module name.
    Please open CMD, using “sfc /scannow” to check/repair system files, and here is a .NET framework repair tool: https://support.microsoft.com/en-us/topic/microsoft-net-framework-repair-tool-is-available-942a01e3-5b8b-7abb-c166-c34a2f4b612a

    The CLR has been fatally corrupted, this is most often caused by data corruption

    a single version of the CLR typically has multiple versions of the .NET Framework that it works with. With regards to SQLCLR code, SQL Server only works with a single version of the CLR, and the specific version depends upon the version of SQL Server.
    So you might consider whether there is a problem in terms of version compatibility.

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  2. Limitless Technology 39,471 Reputation points

    Hello BandithKhorn,

    I would first check the all the .NET requirements are met for SQL 2008R2:https://learn.microsoft.com/en-us/troubleshoot/sql/install/understanding-dotnet-framework-requirements

    If all seems good, you should try the .NET Repair Tool kit: https://support.microsoft.com/en-us/topic/microsoft-net-framework-repair-tool-is-available-942a01e3-5b8b-7abb-c166-c34a2f4b612a

    Hope this helps in your case,
    Best regards,

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  3. Erland Sommarskog 103.9K Reputation points MVP

    Try installing the most recent version of SSMS from here: https://learn.microsoft.com/en-us/sql/ssms/download-sql-server-management-studio-ssms.

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