It is an annoying issue interrupting your attention and destroy the gaming experience when you are playing Minecraft.
Related article:How to Use Hamachi for Minecraft?
Check Answers from Here!

Step 2: SwitchView by:toSmall iconsand chooseNetwork and Sharing Center.
Step 3: press your Internet connection (Usually Ethernet) and chooseProperties.
Step 5: Then input8.8.8.8for the box next toPreferred DNS serverand8.8.4.4for the box next toAlternate DNS server.

Step 6: Check the box forValidate options upon exitand chooseOKto preserve your choice.
If you meet the DNS server unavailable error, then you cant connect to your Internet.
Thus, it’s possible for you to read this post to get some methods to fix it.

Here is the way.
Step 1: Typecmdin Search and runCommand Promptas an administrator.
Then you’re able to kill the window and relaunch Minecraft to see if the issue is resolved.
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Then you might add Minecraft to the white list so that Windows Firewall will allow Minecraft to run.
Step 2: Then chooseAllow an app through firewalland in another window, selectChange settingsandAllow another app….
Step 3: ClickBrowse…to choose Minecraft EXE file and selectAddto add it to the Firewall.

Hope this article can resolve your issue.