Selenium grid is providing exception :PROXY_REREGISTRATION
I had a similar issue couple of days ago. Apparently I was using an old version of selenium-node image. I updated to latest version and the issue was resolved.
I was facing the same issue, later I figured that for some reason the node was getting registered twice in my code so due to which PROXY_REREGISTRATION error was coming. After removing the duplicate node registration, this issue got resolved.