Common Minecraft Errors

Server Crashes

To find the cause of the crash, click on the Files tab, then on crash-reports, and look at the Description near the top along with the next line. If you see one of the errors below, read that section. Otherwise, contact support so they can help you interpret the crash report.

ServerHangWatchdog detected that a single server tick took 60.00 seconds

This normally happens when there are items all over the ground or too many mob entities. So try the following:

  1. Stop your server if it isn't already.
  2. Under the Files tab, click on
  3. Change max-tick-time to -1 (this will let your server start even with high tick times).
  4. Restart your server and wait for it to finish starting
  5. Use the following command in the console to remove hostile mobs: difficulty peaceful
  6. Use the following commands in the console to kill extra items and xp orbs on the ground: kill @e[type=item] and kill @e[type=xp_orb] (or kill @e[type=experience_orb] for newer Minecraft versions)
  7. Log in to your server and use the commands again but with a slash in front of them: /kill @e[type=item] and /kill @e[type=xp_orb](or /kill @e[type=experience_orb]). You will need to be an Op to use these commands in-game.
  8. Change max-tick-time back to 60000 and restart your server, so that the server lets you know when it's having a problem like that again by crashing, and so mobs start spawning again.


Caution on the Kill Command

Make sure to type the kill commands EXACTLY as they are. Do NOT change "type" to something else.

If that does not work to fix the crashes, you may need to roll back your server to before the crashes started. But feel free to contact support to have them take a closer look.

Client Connection Errors

When you try to connect to a Minecraft server, sometimes you'll get an error preventing you from doing so. The following are some of the possible errors. If you don't see your error here, contact support so they can help figure out your error.

Can't Resolve Hostname or Unknown Host

When you create your server, you had to also create a friendly address similar to That is a domain address. Domain Name System (DNS) servers transfer that information between each other across the world. That can take some time. So if you are getting this error, that means your DNS server has not received this information yet. So you can either wait about 30 minutes for it to do so, or you can connect using the ip:port located at the top of Command Center. It will look something like this: 123.321.234.432:4321

Server IP:PORTServer IP:PORT

Server IP:PORT

Connection Refused or "Old"

You will usually receive this error when the server is not done loading. This can happen often with modded Minecraft. Some modpacks can take up to 15 minutes to load.

To test if your server is done loading, you can either use a test command in the console and see if you get the correct response, or you can check your server list and see if the player count has shown up:

Correct Command ResponseCorrect Command Response

Correct Command Response

Player Count Shows When Done LoadingPlayer Count Shows When Done Loading

Player Count Shows When Done Loading

Failed to login: Error / / error code of 503

These errors typically indicate something wrong with the Minecraft login servers which authenticate the player names with registered Minecraft accounts. It is not a problem with our service. You’ll be able to connect as soon as Mojang fixes the login servers. The best way to keep track of Minecraft service uptime is to check out the official Minecraft status Twitter account.

Forcibly Closed, Time Outs, Connection Lag, and High Ping

Sometimes you'll get timeouts, high ping, or the error Forcibly Closed when you try to connect to a Minecraft server. Try the following to fix the issue:

  1. Check the Game Settings page on your server for any special instructions the modpack/game may have. (For instance, some really old modpacks require offline mode.)
  2. Make sure you have 6-8GB of RAM allocated to your Minecraft client or launcher
  3. Make sure you have migrated to the Microsoft login
  4. Reinstall the modpack, if you're using one, by deleting the folder and then installing the modpack again. MAke sure to install the exact same version as your server.
  5. Restart your router
  6. Restart your computer
  7. Restart your server
  8. Use a wired internet connection instead of wi-fi if possible (satellite and mobile hotspots usually don't connect very well).
  9. Connect using the ip:port instead of the friendly address
  10. Refresh your IP and DNS. To do so:
    1. Press the Windows Key, then type cmd.
    2. Right-click Command Prompt and click Run as administrator
    3. Type netsh winsock reset and press Enter.
    4. Type netsh int ip reset and press Enter.
    5. Type ipconfig /release and press Enter.
    6. Type ipconfig /renew and press Enter.
    7. Type ipconfig /flushdns and press Enter.
  11. Create a firewall exception for Minecraft and Java.
    1. On the Windows Search Bar: Search for "Windows Firewall"
    2. Click on "Windows Firewall" or "Windows Defender Firewall"
    3. Click on "Allow an app through Windows Firewall"
    4. Click Change Settings (Have to be an Admin)
    5. Scroll down to Java(TM) Platform SE Binary (there will be more than one)
    6. Tick the 'Private' checkboxes for all of those
    7. Click Ok
  12. Change your DNS provider
  13. Disable any anti-virus or VPN software that is running (or try a VPN if you're not using one)
  14. Try an alternate connection (like a mobile hotspot or wifi, as a temporary test).
  15. Try an alternate computer
  16. Reset Playerdata for the player who can't connect
  17. If you were able to connect before, try rolling back the server to when you were able to connect.
  18. If the above does not work, contact support and make sure to provide us with both Ping and MTR test results, and we can pursue further solutions.

Kicked for Flying

See this article for instructions to enable flight on your server.

Mismatched mod channel list or Failed to synchronize registry data from server

These errors usually mean that the modpack running on your server and the version running on your client aren't the same.

To check the version of the modpack installed on your server, click on the Gear icon, then click Game Settings. Scroll past the modpack description, and look for the Installed Version.

Checking the version installed on your client will vary based on which client you're using, but it's most often listed in the top-right corner of the modpack profile.

If these versions aren't the same, you'll need to either update your client (please check the support for your launcher of choice) or you'll need to update your server.


Custom or Edited Modpacks

If this is for a custom modpack or a modpack that has been edited, you'll need to make the same changes to both server and client. When editing a modpack or creating a custom one, please make sure to test only one mod at a time so you know which mod you changed is causing the connection issue.

If these versions are the same, please contact support.

Took too long to log in

This happens when your computer is not able to load fast enough. Check that your launcher, such as CurseForge, has 8gb of RAM set up in the Minecraft settings.

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