title: Rancher-ui show nginx 502
body: <p>My rancher run in docker container, everything work is fine before, but now，when I try to login to rancher，web hint me Bad gateway 502 nginx. I try to telnet to rancher docker host is normal, then I check log file, log show me can't pull images.
  Then I try to open network and restart docker container and check log, log does not scroll,stagnant in the previous state（can`t pull images）, and I also try to copy docker volume to run new container, also show this problem, but when I run brand new rancher docker container，everything appears normal.
  Does anyone have an idea why it happended or did I do something wrong with the configuration? Thank you in advanced!
  Sorry about I not enough 10 reputation to post images.
  <a href="https://i.stack.imgur.com/pF4wz.png" rel="nofollow noreferrer">logs</a></p>