Hello everyone,
when I log into Jenkins, I immediately get an error message “Access denied(admin is missing the Overall/Read permission)” and as a result I can no longer operate my Jenkins.
[See screenshot]
You obviously removed the Administer permission for this user.
Check the file $JENKINS_HOME\config.xml
There you should see the permissions normally. Depending on which authorization strategy you use (matrix or role-strategy) the format looks different.
You can then stop your Jenkins, fix the permissions in the file and then restart Jenkins