Suddenly only access to Server Default Page? Alt. URL not available?

Hello,

I have a wordpress installation running on a domain which is not set to our server DNS yet, so I am using the Alt. URL of it to access the backend and make changes etc.

The Alt. URL is always like dmn12.myserver.tld

Today I wanted to log in again to do some work on it but I am always forwarded to the server default page and can not access the wordpress page or the backend.

Any idea what could be the issue here?

Thank you for your help!

Okay, I already found the issue. I had the "always use https" activated on firefox, added an exception to it and now it works.