Form edition .NET5 blocked by group policy - AppLocker blocking DESIGNTOOLSSERVER.EXE from TEMP folder

Question

Dear support,

I do use current vs2019 v16.9.2

I do have currently an issue when trying to edit a Form of a project targeting .NET5: just get a popup "This program is blocked by group policy...."

Checking log from Event Viewer to see what AppLocker blocks: %OSDRIVE%\TEMP\WINFORMSCACHE\ZDU3FGFN.CIC\DESIGNTOOLSSERVER\DESIGNTOOLSSERVER.EXE was prevented from running.

There is no such error when editing a Form from another project targeting .NET Framwork 4.7.2.

What could be done? Is there a setting for vs2019 to use another temp folder?

Kind regards, Charles

Answer 1

Hi CharlesLales,

It seems that there are some limitation on your environment. You can try to follow these steps to troubleshoot it:

1. Confirm you can use .NET 5.0 framework in your environment
2. Try other machines in the same environment
3. Uninstall and reinstall .NET5.0 framework
4. Recreate a new Winform project

If they don't work, please contact your system adimistrator.

Best Regards, Dylan

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Answer 2

Hi,

I can compile and exec .NET 5.0 Form.

Simply when trying to edit this form, vs2019 try to exec this:
%OSDRIVE%\TEMP\WINFORMSCACHE\ZDU3FGFN.CIC\DESIGNTOOLSSERVER\DESIGNTOOLSSERVER.EXE

And %OSDRIVE%\TEMP is blocked by AppLocker for standard user.

If I run the application with ADM elevation -> working of course.

So 2 options:

• A setting in vs2019 let change this tmp location to another folder
• System Adm create an exception in AppLocker for this particular folder..

Kind regards,
Charles

Answer 3

similarissue after vs update maybe;
why it clone here in temp my project and cache use all space
WinFormsCache\zac1wwnx.2oe\DesignToolsServer\UserAppData
and form design not open same for 5.0 and 3.1 core