If Two Tier: Verify the Identity is set to the expected IIS User.
If it matches the existing Service Account, initial changes may be desired to separate the accounts.
Right click AppCDownloads > Advanced Settings > Process Model
Click the dots next to Identity
Single Tier: Built-in account: ApplicationPoolIdentity
Two Tier: Custom account > Set... > enter relevant IIS User
Repeat for DefaultAppPool
Use an administrative command prompt to issue the command:
iisreset
Additional Information
If you have an App Control Agent installed, but do not know the Global CLI Password you will need to make the changes to the Services & IIS Identity via Safe Mode.
In some instances the temporary files in the Service Account's \AppData\Local\Temp\ must be deleted, while the Server services are stopped. Example path:
C:\Users\SERVICEACCOUNT\AppData\Local\Temp
If you have an App Control Agent installed on the server you will need to also temporarily stop & unload the Agent and before deleting the files.
If the Service Account is repeatedly automatically locked in Active Directory, follow the steps here.