Problem: When trying to log in to the VSA, it gives the following error: "HTTP Error 400.10 - Bad Request" - as well as a failing reapply schema on the KServer:
Cause: It is because of the corrupt file "applicationHost.config" located here: "C:\Windows\System32\inetsrv\config".
Resolution: Follow below steps to resolve the issue:
1) Delete/Rename the file "applicationHost.config" located in directory "C:\Windows\System32\inetsrv\config" on your Kaseya Server
2) Download the attached file and place it there
3) Run a re-apply schema
4) Confirm if the issue is resolved.