[Fixed] Gitlab on diffrent Server then domain

There was an wrong config from the Domain forward.

Hello Community,

i installed gitlab today. All works finde, i can access Gitlab with the Servers IP (xxx.xxx.xxx.xxx).
But i want to use my own Domain (domain.tld), Gitlab is on an complete seperate Server.
I made an alias (git.domain.tld), and pointed that to the IP. In the github.bs (i think it was that ending), I set the external_url ‘http://git.domain.tld’ - if i type the domain in my browser, i come to the Gitlab, but i have been redirectet to IP (xxx.xxx.xxx.xxx)…
So, how can i use that domain?

Sorry for a maybe stupid question