Migrate group from 1 self-hosted GitLab to another self-hosted GitLab by using direct transfer

Problem to solve

I am trying to migrate 1 Gitlab group from Test Gitlab instance to Prod Gitlab instance. Both are self-hosted, running on same version 17.3
Source instance is gitlab-ce
Destination instance is gitlab-ee

I follow the steps here: Migrate groups and projects by using direct transfer | GitLab
I did all preparation steps.
Now I am on Connect the source GitLab instance
On destination instance I go to my Main group and go to Create New group and Import group.
I fill in:
GitLab source instance base URL
Personal access token
Click Connect instance

I get error: Specified URL cannot be used: “Requests to the local network are not allowed”

From destination server CLI I am able to reach Source URL with curl, there should be no firewall blocking traffic.
Any help why this could be?
I am under impression that migration between 2 self-hosted instance should be supported.
Could migration from gitlab-ce to gitlab-ee cause an issue?

Versions

  • Self-managed

Versions
17.3

Perhaps this helps: Filtering outbound requests | GitLab