Troubleshooting COM Class Factory Errors in BizTalk360

  • Published on Nov 5, 2026
  • 1 minute(s) read
Prev Next

Problem 1: Registry Key Marked for Deletion

You may encounter an error as shown below while accessing the application:

Retrieving the COM class factory for component with CLSID failed due to the following error: 800703fa Illegal operation attempted on a registry key that has been marked for deletion. (Exception from HRESULT: 0x800703FA)

Cause

This issue can occur when BizTalk360 is configured to run under a specific user account.

When the user logs off, Windows may unload the user's profile, including the associated registry keys. If the BizTalk360 application or one of its processes continues to access those registry keys, the application may encounter the 0x800703FA error or the exception below.

Solution

As a workaround, configure Windows not to forcefully unload the user's registry when the user logs off. You can enable the Do not forcefully unload the user registry at user logoff policy.

Follow these steps:

  1. Open Group Policy Editor by running gpedit.msc.

  2. Navigate to:
    Computer Configuration → Administrative Templates → System → User Profiles

  3. Locate Do not forcefully unload the user registry at user logoff.

  4. Select Edit Policy Setting.

  5. Change the setting from Not Configured to Enabled.

  6. Apply the changes.

image.png

Once enabled, Windows will not forcefully unload the user's registry during logoff and will wait until it confirms that no other processes are using the registry.

This policy adds the DisableForceUnload registry value.

image.png

As a standard recovery procedure, perform an IIS reset on the BizTalk360 server after applying the policy change.