Here is what I do know about this issue, When the server connects, it will show an error message seen below where it says you can't connect
It can go for all servers if it is down, is there a way to prevent server crash?
This will serve as a screenshot: https://twitter.com/DiselKadenRBLX/status/820766695774154753
Comments 2
It means that the server is blocking your connection:
https://bugs.mojang.com/browse/MC-82765?focusedCommentId=235470&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-235470
Please add a screenshot or litteral text with/of your error message.