Cannot remove reverse proxy entry

I cannot remove an reverse proxy entry. When I click in “Remove” in the confirmation dialog box, it does nothing. Even the dialog boxs keeps open.

Are you using Cockpit or nethGUI?

Cockpit. I just solved the problem:

The settings contained something which is not allowed any more after the checks have been made stronger. After removing the settings from the reverse proxy entry, I was able to delete it. It seems that “delete” does data validation first, which is a little strange.