Push mirrors stopped working with v16.9.1

Summary

We updated to v19.6.1 and after that, the push mirroring of repositories stopped working and the system sent emails with error message The remote mirror URL is invalid..

Screenshot:

In the settings of the project there is an error notification (mouse over shows: The remote mirror URL is invalid.)

Screenshot_2024-02-26_at_11-17-52_Repository___Settings___Knut_Wenzig___additionalmetadata___GitLab

The attempt to re-configure an push mirror to a repo within the same Gitlab instance results with error: Remote mirrors url is blocked: Requests to loopback addresses are not allowed

Screenshot_2024-02-26_at_11-13-34_Repository___Settings___SOEP_Generierungen___Dokumentation___GitLab

Steps to reproduce

Try to specify push mirror like in this screenshot, even to existing and new repositories:

Screenshot_2024-02-26_at_11-10-34_Repository___Settings___SOEP_Generierungen___Dokumentation___GitLab

Edited by Knut Wenzig