ERROR Error querying the server, waiting 5m

[AxelM35]

I get the following error "ERROR Error querying the server, waiting 5m".

I run the server on my QNAP NAS using Qnap Container Station and your minecraft server and backup docker images.

Here is the log from mc-backup :

2025-07-05T12:35:31+0000 INFO waiting initial delay of 1m...
2025-07-05T12:36:31+0000 INFO waiting for rcon readiness...
2025-07-05T12:36:31+0000 INFO Command executed successfully rcon-cli save-on
2025-07-05T12:36:31+0000 INFO Command executed successfully rcon-cli save-off
2025-07-05T12:36:31+0000 INFO Command executed successfully rcon-cli save-all flush
2025-07-05T12:36:35+0000 INFO Command executed successfully sync
2025-07-05T12:36:35+0000 INFO Backing up content in /data to /backups/world-20250705-123635.tgz
2025-07-05T12:36:35+0000 INFO Command executed successfully rcon-cli save-on
2025-07-05T12:36:35+0000 INFO Pruning backup files older than 7 days
2025-07-05T12:36:35+0000 ERROR Error querying the server, waiting 5m...

And here is the log from the mc-server (I've just replaced the nas IP by SERVER_IP):

[12:36:31] [RCON Listener #1/INFO]: Thread RCON Client /SERVER_IP started
[12:36:31] [RCON Client /SERVER_IP #10/INFO]: Thread RCON Client /SERVER_IP shutting down
[12:36:31] [RCON Listener #1/INFO]: Thread RCON Client /SERVER_IP started
[12:36:31] [Server thread/INFO]: [Rcon: Automatic saving is now disabled]
[12:36:31] [RCON Client /SERVER_IP #11/INFO]: Thread RCON Client /SERVER_IP shutting down
[12:36:31] [RCON Listener #1/INFO]: Thread RCON Client /SERVER_IP started
[12:36:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved
[12:36:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[12:36:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[12:36:31] [Server thread/INFO]: ThreadedAnvilChunkStorage: All dimensions are saved
[12:36:31] [Server thread/INFO]: [Rcon: Saved the game]
[12:36:31] [RCON Client /SERVER_IP #12/INFO]: Thread RCON Client /SERVER_IP shutting down
[12:36:35] [RCON Listener #1/INFO]: Thread RCON Client /SERVER_IP started
[12:36:35] [Server thread/INFO]: [Rcon: Automatic saving is now enabled]
[12:36:35] [RCON Client /SERVER_IP #13/INFO]: Thread RCON Client /SERVER_IP shutting down

Thank you in advance, I'm very very new to all of this!

[itzg]

Please post your compose file or container config. I'm suspecting you changed your container side server port. Be sure to read through

https://docker-minecraft-server.readthedocs.io/en/latest/configuration/server-properties/#server-port

[AxelM35]

I have indeed. I couldn't open the default port to access my server online due to ISP restriction. Here are the env variables I used :

I've just replaced my IP by SERVER_IP and the custom port number with CUSTOM_PORT

"INITIAL_DELAY=1m"
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
"BACKUP_INTERVAL=24h"
"RCON_PORT=25575"
"TAR_COMPRESS_METHOD=gzip"
"SERVER_HOST=RCON_HOST"
"SERVER_PORT=**_CUSTOM_PORT_**"
"DEST_DIR=/nas-host-backups/mc-server-backups"
"ENABLE_SAVE_ALL=true"
"LINK_LATEST=false"
"PLAYERS_ONLINE_CHECK_INTERVAL=5m"
"RESTIC_ADDITIONAL_TAGS=mc_backups"
"PAUSE_IF_NO_PLAYERS=true"
"PRUNE_RESTIC_RETENTION=--keep-within 7d"
"RCON_RETRY_INTERVAL=10s"
"BACKUP_METHOD=tar"
"ENABLE_SYNC=true"
"RESTIC_VERBOSE=true"
"SRC_DIR=/data"
"BACKUP_ON_STARTUP=true"
"EXCLUDES="
"RCON_HOST=_**SERVER_IP**_"
"HOME=/tmp"
"ZSTD_PARAMETERS=-3 --long=25 --single-thread"
"BACKUP_NAME=world"
"PRUNE_BACKUPS_DAYS=7"
"RCON_PASSWORD=864a94e46721028544796fb4"
"RCON_RETRIES=5"

In my minecraft server.properties file I made the following changes :

query.port=CUSTOM_PORT
server-port=CUSTOM_PORT

Thanks for answering so quickly!

[AxelM35]

Hello,

Adding a comment just to say that I have solved the issue. It was not a port issue. The problem was coming from this environment variable :

"SERVER_HOST=RCON_HOST"

The SERVER_HOST is indeed exactly the same as the RCON_HOST but the RCON_HOST value was not transmitted this way.

I've just entered the IP address in full and it works like a charm.