Several of you reported expired certificate of
copr-fe.cloud.fedoraproject.org
This url was only used at very earlier stage of this project and now is
deprecated. It still exist albeit with expired certificate, but it will
be removed soon.
Please replace your bookmarks with either
copr.fedoraproject.org
or
copr.fedorainfracloud.org
The second one is preferred for now.
Miroslav Suchy