Umbraco Backoffice not working on a new Server

Hello All,

Facing issue with Umbraco 7.15.3 back office. Unable to login to Umbraco backend only on the new server. This works fine on a different server and on my dev environment.

The only difference is on this new server I use SQL express edition.

Just receiving "Login failed for user ".

While debugging noticed the error "Failed to load resource: the server responded with a status of 403 /umbraco/backoffice/UmbracoApi/Authentication/PostLogin 403. in my developer console.

Any help/suggestion is my appreciated.

Thanks in advance.


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/103818-umbraco-backoffice-not-working-on-a-new-server