io.netty.channel.ConnectTimeoutException: connection timed out
Most likely cause: The target server is offline, full, or unreachable from your network
Try first: Verify the server address and status
Likely causes
- The target server is offline, full, or unreachable from your networkmost likely
- Your internet connection or router is blocking or dropping the packetspossible
- Wrong server address or port entered in the multiplayer listpossible
- Firewall or antivirus temporarily blocking Minecraft's outbound connectionsless likely
How to fix it
Verify the server address and statusSafe
Double-check the IP and port in the multiplayer screen; visit a site like mcsrvstat.us and enter the address to see if the server shows as online.
Test your internet connectionSafe
Open a web browser and load a few different sites; if pages are slow or fail, restart your router or switch to mobile hotspot to test.
Temporarily disable firewall or VPNChanges settings
Turn off any VPN, proxy, or third-party firewall for a minute and try connecting again; re-enable it afterward.
⚠ Disabling security tools reduces protection until re-enabled.
Allow Java/Minecraft through Windows FirewallChanges settings
Open Windows Security > Firewall & network protection > Allow an app through firewall and make sure Java(TM) Platform SE Binary / Minecraft is allowed on Private networks.
If that didn't fix it
Try joining a different public Minecraft server to see if the problem is specific to one address or affects all connections.
When to see a technician
Contact a technician if the timeout happens on every server even after confirming your internet works and no firewall is active.
Quick answers
- What does io.netty.channel.ConnectTimeoutException: connection timed out mean?
- This Minecraft error means the game tried to reach a server using its networking code (Netty) but got no reply within the time limit, so the connection failed.
- What causes io.netty.channel.ConnectTimeoutException: connection timed out?
- The target server is offline, full, or unreachable from your network. (most likely) Your internet connection or router is blocking or dropping the packets. (possible) Wrong server address or port entered in the multiplayer list. (possible) Firewall or antivirus temporarily blocking Minecraft's outbound connections. (less likely)
- How do I fix io.netty.channel.ConnectTimeoutException: connection timed out?
- Try these in order, safest first: 1. Verify the server address and status. 2. Test your internet connection. 3. Temporarily disable firewall or VPN. 4. Allow Java/Minecraft through Windows Firewall.
- What if that didn't fix it?
- Try joining a different public Minecraft server to see if the problem is specific to one address or affects all connections.
- When should I see a technician?
- Contact a technician if the timeout happens on every server even after confirming your internet works and no firewall is active.