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  • Could you add the results of a traceroute in terminal/command prompt (to the IP address of a minecraft server) along with a launcher log of the error? (To get the full launcher logs, open the launcher to start the game and go to settings and enable "Keep Launcher open when game is running" and "open output log when the game starts." Then, launch the game, try to connect to server, and copy the log output.) Commented Aug 24, 2017 at 1:58
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    Windows CMD -> ipconfig /flushdns or try using a different/public DNS server (network -> properties -> ip v4 -> properties)... easy to do and sometimes it helps. Commented Aug 24, 2017 at 6:52
  • Are you using Windows 10? Commented Dec 4, 2018 at 17:23
  • I was finally able to connect to my Minecraft server (using the IPv4 Address) by allowing all Java apps and the 1.15.2.jar file through my firewall. Plus don't forget you have to start up your Minecraft server (clicking n the run.bat or server.jar files) prior to connecting to the server in Minecraft Multiplayer mode! After restarting my computer many times I sometimes forget I have to restart the Minecraft server too. :-) Commented Feb 2, 2020 at 15:50
  • I have disabled firewall on both computers (client and host) and get this error. Before, the connection would just time out. It seems like this might be firewall related after all, but if the firewall is truly off on both machines, why is it refusing to connect? Commented Jul 21, 2021 at 17:35