@Matthew Ziegler, @Alexander Torstling,
I also Had a windows Update the night I last played on my realm, on 14 Aug 18 around 2300.
I was kicked from the realm shortly before the software update. That is when I decided to call It a night and let my computer update and shut down, I did not think much of it until now.
I cannot make changes to my realm, IE: Switch world, close realm, download backup, ect.
No indication anyone is still joined in, my friends confirm they cannot join, as our games crash when we attempt to join the realm. A very brief "failed to connect to server" message flashes before the crash. If I attempt to join in the latest 1.13.1-pre1 snapshot it reads "io.netty.channel.AbstractChannel$annotatedConnectException: Connection refused: no further information: ".
My crash logs are very similar if not identical to the ones I have seen on this site for similar issues.
Steps I took to remedy were in the following order:
-Replicate crash with exact actions.
-Succesfully Log into regular server (Play.wynncraft.com).
-Attempt to make changes to realm; Switch world, download back up, close realm. Of which attempting any results in a waiting loop (quit after half an hour).
-Research online for similar issues in and after I suspect the issue arose.
-Ensure several drivers are up to date (OS, video card).
-Updated Java to version 8 Update 181 (build 1.8.0_181-b13).
-Replicate crash dozen more times.
No success in my issue.
No change in status, game still crashes when I attempt to gently hop into my realm.
Edit: I went to my library and deleted 1.13 from my minecraft versions to force a download, Now able to connect, waiting on feedback from my friends.