Minecraft: Exposing 25565 or 80 still got connection reset on multiplayer

ampersanda · March 29, 2023, 3:52pm

Hello, I tried to install minecraft server in my fly io account. It’s running but I have problem that I can’t connect to it.

Here’s what I tried:

Exposing 25565 port by setting EXPOSE 25565 on my Dockerfile and internal_port
Switching to expose 80 port by exactly changing above values

Dockerfile

FROM itzg/minecraft-server

# Set server properties
ENV EULA=TRUE
ENV MOTD="Minecraft Server"
ENV MAX_PLAYERS=10

# Add players to ops.txt
RUN echo "player1" > ops.txt && \
    echo "player2 >> ops.txt && \
    echo "player3 >> ops.txt && \
    echo "player4 >> ops.txt

# Add players to whitelist.txt
RUN echo "player1 > whitelist.txt && \
    echo "player2" >> whitelist.txt && \
    echo "player3 >> whitelist.txt && \
    echo "player4 >> whitelist.txt

EXPOSE 25565

my fly.toml

app = "minecraft-app"

kill_signal = "SIGINT"
kill_timeout = 5

[[services]]
  internal_port = 25565
  protocol = "tcp"

  [services.concurrency]
    hard_limit = 10
    soft_limit = 10

  [[services.ports]]
    handlers = ["http"]
    port = "80"

log

  2023-03-29T15:46:35.305 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Starting minecraft server version 1.19.4
2023-03-29T15:46:35.305 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Loading properties
2023-03-29T15:46:35.306 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Default game type: SURVIVAL
2023-03-29T15:46:35.306 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Generating keypair
2023-03-29T15:46:35.474 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Starting Minecraft server on *:25565
2023-03-29T15:46:35.542 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Using epoll channel type
2023-03-29T15:46:35.720 app[6faa96bc] sin [info] [15:46:35] [Server thread/INFO]: Preparing level "world"
2023-03-29T15:46:51.860 app[6faa96bc] sin [info] [15:46:51] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
2023-03-29T15:46:54.524 app[6faa96bc] sin [info] [15:46:54] [Worker-Main-6/INFO]: Preparing spawn area: 0%
2023-03-29T15:46:54.531 app[6faa96bc] sin [info] [15:46:54] [Worker-Main-6/INFO]: Preparing spawn area: 0%
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2023-03-29T15:48:04.438 app[6faa96bc] sin [info] [15:48:04] [Server thread/INFO]: Time elapsed: 72576 ms
2023-03-29T15:48:04.439 app[6faa96bc] sin [info] [15:48:04] [Server thread/INFO]: Done (88.723s)! For help, type "help"
2023-03-29T15:48:04.439 app[6faa96bc] sin [info] [15:48:04] [Server thread/INFO]: Starting remote control listener
2023-03-29T15:48:04.447 app[6faa96bc] sin [info] [15:48:04] [Server thread/INFO]: Thread RCON Listener started
2023-03-29T15:48:04.447 app[6faa96bc] sin [info] [15:48:04] [Server thread/INFO]: RCON running on 0.0.0.0:25575

DAlperin · March 29, 2023, 4:01pm

Minecraft doesn’t connect over http. Try changing your handler to tcp.

ampersanda · March 29, 2023, 4:07pm

Thank you for the help.

I just tried updating to

  [[services.ports]]
    handlers = ["tcp"]
    port = "80"

and also tried

  [[services.ports]]
    handlers = ["tcp"]
    port = "25565"

and I got Error App configuration is not valid when try to do fly deploy, should I update somewhere?

sorry, I’m new in this

DAlperin · March 29, 2023, 4:11pm

Oh my bad your ports section should actually look like this (no handlers required):

  [[services.ports]]
    port = "25565"

ampersanda · March 29, 2023, 4:25pm

I got it working!!! It also needs to pay extra $2 for dedicated IP address (by running fly ips allocate-v4)

Thank you for the help

system · April 5, 2023, 4:25pm

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