Connectivity Problem with Minecraft - Can not join the Server

Technical Support
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21

Alright, if the port’s showing up as open, your ISP’s innocence is preserved (for now). :sweat_smile: That means external traffic is probably reaching your router’s open port, but it’s getting lost somewhere between the router and AMP/Minecraft.

Double-check these:

  1. Port Forwarding Target IP: Is it pointing to the correct local IP of your server (not your PC)? If the server’s local IP changes, the port forward could be misdirected!
  2. Minecraft Server Settings: In AMP, under “Settings”, confirm Minecraft is set to accept connections using 0.0.0.0 or the server’s local IP in the “Server IP” field (not the public IP). Using a specific IP unnecessarily limits external access sometimes.
  3. Port Settings in AMP: Verify that port 25565 is set correctly in your server settings within AMP—go to the “Configuration” and check there too.

If all this checks out, we’re running out of usual suspects. Let me know what you find!

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Everything is right like u said

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Well, well, your setup sure loves playing hard to get. If everything’s peachy on your end, then something peculiar is still blocking external traffic after it hits your network but before Minecraft reacts. :face_with_steam_from_nose:

Let’s try a sanity check with AMP directly. In AMP’s “Support” tab under “Diagnostics,” there’s a handy “Copy data to clipboard” button—use that. Once you’ve got the debug info, paste the juicy bits here (as text). It’ll give us a much clearer look at what AMP and your router think is happening.

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“Configuration” nothing more is in there

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Ah, AMP’s keeping its cards close to its chest. No detailed juicy diagnostic logs? Fine. We’ll do it the hard way. :face_with_steam_from_nose:

Let’s test if your network setup is the issue. Here’s a quick workaround:

  1. Fire up a simple web server or file-sharing app on your server (or any other server software using a new port, e.g., 8080).
  2. Forward the port for that app (8080, in this example) like you did for Minecraft.
  3. Ask someone external to access that service via your public IP (e.g., yourip:8080).

If they can connect to that test app, your network setup’s fine—it points back to something Minecraft-specific. If the issue persists with this new test, your network is the villain.

Up for it? Let’s unravel this plot twist!

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how do i do this???

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Alright, no worries—let me break it down step by step for you!

Quick External Test with Python :snake:

  1. Install Python (if it’s not already installed):
    On Ubuntu, run this command:

    sudo apt update && sudo apt install python3

  2. Run a Simple Web Server:
    Go to any folder on your server with:

    cd ~

    Then start a lightweight web server on port 8080:

    python3 -m http.server 8080

  3. Forward Port 8080 in Your Router:
    Just like you forwarded port 25565 for Minecraft, forward port 8080 to the same internal IP of your server.

  4. Ask a Friend/Tester:
    Share your public IP like this: http://yourpublicip:8080
    Have someone outside your network plug it into their browser. If they see a basic webpage of the folder contents, the connection is working.

  5. Stop the Server:
    Once done, stop the web server by pressing CTRL+C in your terminal.

If they can connect to this simple server but still can’t connect to Minecraft, it’s clearly some Minecraft-specific config headache. If they can’t connect at all, we pin it down to your network. Let me know how it goes! :glowing_star:

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Says its Adress already in use

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Ah, “Address already in use” means another app or process is already hogging port 8080. Let’s pick a different, less crowded port and try again!

  1. Run the web server on a different port, like 9090:

    python3 -m http.server 9090

  2. Forward port 9090 on your router to your server’s internal IP—just like you did with Minecraft and 25565.

  3. Then, share your updated public IP with the new port: http://yourpublicip:9090. Get someone outside your network to access it.

If that still fails, we’re zeroing in on bigger network gremlins. Let me know how it plays out!

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Outside of network cant access

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Well, there’s the smoking gun—we’ve got some network-level trickery going on. If both Minecraft and this test web service fail to allow external connections (despite your port forwards), here’s the big culprit list:

  1. Double NAT or ISP CGNAT
    Your router might not actually be directly exposed to the internet. ISPs sometimes put home users behind a Carrier-Grade NAT, which blocks direct incoming connections. Call your ISP and ask:

    • “Am I behind a double NAT?”
    • “Do I have a public IPv4 address?”

  2. Firewall Mystery
    Even if everything looks good in AMP and your router, there might still be a broader network restriction somewhere. If you’re hosting at home, sometimes firewalls higher up (like ISP-side) block all non-standard traffic.

Next step: Call your ISP to confirm if they’re doing shady NAT stuff or blocking ports by default. Mentioning gaming servers often helps push them in the right direction. Let me know what they say! :thinking:

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