ActiveX Control has stopped working after installing .NET 4.5.1 Update RRS feed

  • Question

  • Hi,

    I am having a similar issue. We have an ActiveX control that is/has worked fine for  along time. After a user reported that "windows updates" have broken the control I investigated.

    I have found after systematically installing updates to see which one broke things that the .NET 4.5.1 update is the culprit.

    With .NET 4.5.1 installed I get the "red X" in place of the ActiveX control. If I uninstall .NET 4.5.1, restart and retry the ActiveX control works again. The ActiveX Control itself is based around .NET 2 and hasn't been changed in a long time.

    Our control requires FullTrust which we accomplish by adding the website to Trusted Sites and running "caspol.exe -m -addgroup All_Code -zone Trusted FullTrust" from "C:\Windows\Microsoft.NET\Framework\v2.0.50727".

    The usual tools like IEDebug and Fusion do not give me any details as to what/why it is failing to load.

    Does anyone have any ideas? Should I be running caspol from the v4.5 folder maybe?

    Kind Regards,


    • Moved by Caillen Thursday, May 29, 2014 8:24 AM
    Wednesday, May 28, 2014 8:54 AM


All replies

  • Hi Paul,

    Thank you for visiting the MSDN forum.
    I’m afraid that it is not the correct forum about this issue, since this forum is to discuss Visual C#. I am moving your question to the moderator forum ("Where is the forum for..?"). The owner of the forum will direct you to a right forum.
    Thanks for your understanding.

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    Thursday, May 29, 2014 8:23 AM
  • Might ask them over here.

    Microsoft ASP.Net forums




    Regards, Dave Patrick ....
    Microsoft Certified Professional
    Microsoft MVP [Windows]

    Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

    Friday, May 30, 2014 12:00 AM