How to change Jenkins mirror, when proxy forbids keyword ftp
I found a workaround:
Download the plugin direct from http://mirrors.jenkins-ci.org/plugins/gitlab-plugin/latest/
Upload the hpi-file into jenkins. There is anupload field in http://host:8080/pluginManager/advanced.
But this is only a workaround. I would like to get an answer to my question: "Is there a way to choose or disable the mirror when downloading plugins for jenkins?"
By default Jenkins is using http://updates.jenkins-ci.org/update-center.json as a "load balancer" url which forwards you to the closest geographical mirror json (i.e. http://ftp-nyc.osuosl.org/pub/jenkins/updates/current/update-center.json for me). What you can do is use your own json file for that purpose by installing this plugin and host json file anywhere you want (i.e. internally):
https://wiki.jenkins.io/display/JENKINS/UpdateSites+Manager+plugin
