When using the AAWebConfigEditor to update the database user information, it does not update the information in the web.config files under AuthAnvilSAS and AuthAnvilAdmin with the new database user information.
This is a bug in AAWebConfigEditor.exe.
Edit the web.config files for AuthAnvilSAS and AuthAnvilAdmin manually, using Notepad. (You will have to run notepad elevated if you are using Windows Server 2008 or later). Replace the ImpersonationUsername, ImpersonationPassword and ImpersonationDomain values with the ones from the web.config file for AnvilManager. When complete, save and run an IISReset.
If you have any questions or need some help, we would be happy to assist. Open a case at kaseya.zendesk.com .