Connectivity Problem with Minecraft - Can not join the Server

System Information

Field Value
Operating System Linux - Ubuntu 24.04.2 on x86_64
Product AMP ‘Phobos’ v2.6.0.12 (Mainline)
Virtualization None
Application Minecraft
Module MinecraftModule
Running in Container No
Current State Sleeping

Problem Description

Issue

I am able to join the server but no one else

Reproduction Steps

  • Checking IP Adress
  • Trying to join Server
  • Getting Error Message

@CubeCoders-Bot help this user diagnose their connectivity issue. Start with checking if they’re hosting at home, and if so check if another game on the same local network can connect. If so then help them with their port forwarding rules.

Alright, Louis, let’s get to the bottom of your server’s antisocial behavior. First question: Are you hosting this Minecraft masterpiece from home? If so, can you check if another game server (like anything lightweight) on the same network is reachable by outside players? This way, we can figure out if it’s a general network/blockage issue or just Minecraft being moody.


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Something diffrent doesnt work aswell

Got it—sounds like your network’s giving the silent treatment to external connections in general. Time to check your port forwarding rules! In your router’s settings, ensure the ports for your Minecraft server (usually 25565) are forwarded to the internal IP of your server. Let me know if you’re unsure how to access or modify those settings, and we’ll dig into router-wrangling!


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Did it. Port ist open both udp and tcp

Sweet, you’ve conquered port forwarding! :door: Now, let’s make sure your public IP address that players are connecting to is actually correct. Can you check your public IP (use something like whatismyipaddress.com)? Also, confirm that your firewall (either on the server or router) isn’t sneakily blocking the connection. Let me know what you find!


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How do i conform that the firewall isnt blocking sth?

Ah, firewalls—guardians of all things internet-y. Since your AMP box is on Ubuntu, AMP should already handle those rules for you. But just to double-check, head to AMP’s “Firewall Manager” in the ADS instance (search “Firewall” in the top-right if you don’t see it). Review those settings and ensure port 25565 is listed and open for Minecraft.

Tell me if it’s not listed or still doesn’t work—this server just loves keeping secrets, huh? :eyes:


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Do i need to change Default AMP IP Binding, Default Application IP Binding, Docker External IP to the IP that i am using to join the server?

Nah, no need to mess with those unless you’re doing something pretty advanced. The default bindings usually work fine, especially if your server’s working for you locally.

Your issue sounds more like a classic networking drama—players outside can’t connect. So unless you deliberately configured AMP for some wildcard IP voodoo or specific interface, leave those alone for now.

Let’s focus on verifying the public IP and connection again. Have you double-checked that players are definitely using the right public IP to connect?


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yes i am its the right ip

Alright, looks like you’ve got all the usual suspects in check—public IP, port forwarding, and firewall. Let’s zero in on AMP’s logs to see what it’s whispering about connection attempts.

Go to the Minecraft instance’s “Logs” section in AMP (right-click → View Logs). Scroll through and see if there are any hints when others try to join—like connection attempts, errors, or anything juicy like that. Post the relevant bits here as text (not screenshots), and we’ll piece together the mystery! :man_detective:


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Nothing. Only if someone tries to join it times out after some time

Alrighty, we’re dealing with a true Houdini-style disappearing connection here. Since the server doesn’t even register attempts, it’s almost definitely getting stopped before it reaches the Minecraft server itself.

Double-check your router’s NAT loopback (aka Hairpin NAT) settings. If that’s disabled, people on the same network might not even be able to test your public IP like external users can. Also, grab a buddy outside your network to see if they run into the same timeout while using your public IP.

Basically: Let’s confirm if this issue is affecting external users or just local chitchat. Care to run that test?


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I can join in the same network
Outside of the network it times out

Ah, so local connections are golden, but the moment someone from the outside world tries—poof! Timeouts. Classic external connectivity problem. :neutral_face:

Since you’ve already nailed port forwarding and firewall settings, it might be an issue with your ISP. Some ISPs sneakily block incoming traffic on certain ports (even common ones like 25565). You might need to check with your ISP to confirm they’re not dabbling in amateur network sabotage.

Alternatively, if you’ve got a double NAT situation (two routers, one acting as a modem and another as your router), that could also mess things up. Are you aware of such a setup?


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how am i able to check isp?

The easiest way to sniff out ISP meddling is to call 'em up and ask directly if inbound traffic on port 25565 (TCP and UDP) is blocked on your connection. Some ISPs impose restrictions unless you ask real nice—or upgrade to a “business plan.” :roll_eyes:

If you’re feeling techy, you could also run a simple port test. Use an online tool like “CanYouSeeMe.org” and punch in your public IP and port 25565. If it says the port is closed despite your heroic port-forwarding efforts, it’s likely your ISP playing gatekeeper. Give that a whirl and let me know! :rocket:


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Canyouseeme.org says its open