Gitlab : how to fork a private repository from server A to a server B?

Question

In a situation where a Gitlab server A has a private project. An other gitlab server B administred by someone else wants (with the authorisation of server A) to fork the private project and be able to make some pull requests on it. Is this possible ?
For the moment I only managed to import the project from the gitlab server A to the gitlab server B which is not what i want to do.

Answer 1

It cannot be forked between servers, so you will need to fork it on server A.

You can always play with mirroring ( Repository mirroring ) but it adds a level of complexity.

Ex: You mirror project from A into server B. You do all the changes on B, and have another fork on A mirroring the project on B.