Affects Version/s: 1.16.3
Fix Version/s: None
Environment:Windows 10, Java Version 8 Update 261
For the last 3 days I've been getting this error and kicked from my Realms server I bought about every 5 to 20 minutes.
Things I've tried to fix the problem:
Java Control Panel > Check box for "Enable the operating system's restricted environment (native sandbox)"
Uninstall / Reinstall
Windows Firewall allow all private
I'm playing PC Java Edition realms on version 1.16.3.
Update: Uninstall / Reinstall after Flushing DNS did have some effect. I did get to play for a few hour span but the problem still comes back after a few hours.