I created a new view in Cloudbees and, while configuring it, wanted it to remain somewhat unnoticed by the rest of my team. I renamed the view to "..", just because it was the first thing that came to mind.
Now I can't delete the group, because the use of ".." is interpreted as directory traversal.
Please specify Jenkins server, port and view name in below way to delete custom view which you created it:
http://<jenkins-server>:<port>/view/<view name>/delete
Jenkins is buggy in this particular functionality.