We are using an selfhosted Gitlab and the admin does not know how this happens.
Sometimes we get this error / See below.
After repeating push again and again, it worked. So its randomly happening.
Some forum suggestions did not help.
Thx in advance
Try with IP first and see if it works.
Since it's on-premise, you may have a problem with custom domain mapping or if there is any proxy host configured you may want to check with that first.
Check with your internal team if you still face the problem