Newly set up instances don't immediately have update center metadata. It takes a moment, or clicking Check Now on Advanced tab.

Hey , Guys , This is a critical bug , It can't work at all !

This bug is block me , Thanks for resolving it ASAP , Thank you !

currently , I manual call the request it works well
http://mirror.bit.edu.cn/jenkins/updates/current/update-center.json

It seems page can't trigger this api at all

Much more information is needed to investigate further. What happens when you do what I suggest in my earlier comment?

See also https://wiki.jenkins-ci.org/display/JENKINS/How+to+report+an+issue

Actually , It has already run two days After I set up the instance , Meanwhile , When I click "Check Now" on Advance Tab manually , If the page is English language , It will display "Checking Updates..." and page is loading for a long time , but back to "Available" Tab , It still empty there , Do you mean it should load local metadata after backend fetching success ?

@Daniel , This issue get resolved by Daniel's suggestion: Click "Check Now" button on "Advanced" Tab of pluginManager page , Wait for while when "Check updates..." done , Then every thing works well . So close this issue now , Suggest to enhance this user experience in future release for automatically loading when click "Available" tab . Thanks Daniel for your comments and solution .