`ACCEPTS_TRANSFERS` not properly mapped

[SolusBellator]

Describe the problem

It appears that the ACCEPTS_TRANSFERS env var is not properly mapped to the server.properties.

I'm setting up a network of 3 servers, unsing your minecraft-router image and this server image. Got everything to work this far (DNS was pain as always), but got disconnected upon invoking /transfer with the error that the other server does not accept transfers.

Went ahead and set

ACCEPTS_TRANSFERS: true

in the compose file for all 3 servers.

After properly restarting the containers, forcing the compose file to be re-read, I still can't connect. checking in on the server.properties files I can see that the accepts-transfers property is still false. I could manually change it, but I would expect this to map, as e.g. MOTD and ENFORCE_WHITELIST do.

Container definition

Paste run command or compose file here

Container logs

Paste logs here

[SolusBellator]

Little addition, I also deleted the server.properties files to see whether it causes a problem when overwriting, but even the newly generated file has the wrong value set.

[itzg]

Works fine for me. Please provide full container logs.

Mine are:

> docker run -it --rm -e EULA=true -e ACCEPTS_TRANSFERS=true -e DUMP_SERVER_PROPERTIES=true -e SETUP_ONLY=true itzg/minecraft-server


[init] Running as uid=1000 gid=1000 with /data as 'drwxr-x--- 2 1000 1000 4096 Oct 31 02:31 /data'
[init] Image info: buildtime=2025-10-31T02:21:41.857Z,version=java21,revision=f62ad37d310d4c035333396876d7c064ef4a0aba
[init] Resolving type given VANILLA
[init] Resolved version given LATEST into 1.21.10
[init] Downloading 1.21.10 server...
[init] Copying any configs from /config to /data/config
[init] Creating server properties in /data/server.properties
[init] Disabling whitelist functionality
[mc-image-helper] 02:51:19.481 INFO  : Created/updated 5 properties in /data/server.properties
[init] DEBUG Dumping server.properties
#Updated 2025-10-31T02:51:19.482404295Z by mc-image-helper
#Fri Oct 31 02:51:19 UTC 2025
accepts-transfers=true
enable-rcon=true
rcon.password=09a9bfcf450b3b6211a108da
rcon.port=25575
white-list=false
[init] Setting initial memory to 1G and max to 1G
[init] Starting the Minecraft server...
SETUP_ONLY: java -Xmx1G -Xms1G -jar minecraft_server.1.21.10.jar

[SolusBellator]

I'm running it via compose:

[init] Running as uid=1000 gid=1000 with /data as 'drwxrwxr-x 13 1000 1004 4096 Oct 30 12:27 /data'
[init] Image info: buildtime=2025-04-19T02:44:43.813Z,version=java21,revision=0ec908b243d1ab435823f653b3777b408aea9e2f
[init] Resolving type given PAPER
[init] Copying any plugins from /plugins to /data/plugins
[init] Copying any configs from /config to /data/config
[init] Creating server properties in /data/server.properties
[init] Enabling whitelist functionality
[init] Setting mode
[mc-image-helper] 12:27:59.140 INFO  : Created/updated 7 properties in /data/server.properties
[init] Downloading default configs, if needed
[init] �[WARN] One or more default config files were not available from https://raw.githubusercontent.com/dayyeeet/minecraft-default-configs/main/1.21.9/paper-global.yml,https://raw.githubusercontent.com/dayyeeet/minecraft-default-configs/main/1.21.9/paper-world-defaults.yml �(B�[m
[init] Downloading default top-level configs, if needed
[init] [WARN] One or more default files were not available from https://raw.githubusercontent.com/dayyeeet/minecraft-default-configs/main/1.21.9/bukkit.yml,https://raw.githubusercontent.com/dayyeeet/minecraft-default-configs/main/1.21.9/spigot.yml
[init] Setting initial memory to 1G and max to 3G
[init] Starting the Minecraft server...
Starting org.bukkit.craftbukkit.Main
*** Warning, you've not updated in a while! ***
*** Please download a new build from https://papermc.io/downloads/paper ***
[12:28:12 INFO]: [bootstrap] Running Java 21 (OpenJDK 64-Bit Server VM 21.0.6+7-LTS; Eclipse Adoptium Temurin-21.0.6+7) on Linux 6.8.0-45-generic (amd64)
[12:28:12 INFO]: [bootstrap] Loading Paper 1.21.9-59-main@0ff899d (2025-10-07T11:49:59Z) for Minecraft 1.21.9
[12:28:12 INFO]: [PluginInitializerManager] Initializing plugins...
[12:28:13 INFO]: [PluginInitializerManager] Initialized 5 plugins
[12:28:13 INFO]: [PluginInitializerManager] Bukkit plugins (5):
 - InvSeePlusPlus (0.30.11), InvSeePlusPlus_Clear (0.30.11), InvSeePlusPlus_Give (0.30.11), Timber (1.7.2), WorldEdit (7.3.17+7262-c7fbe08)
[12:28:24 INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[12:28:30 INFO]: Loaded 1461 recipes
[12:28:30 INFO]: Loaded 1574 advancements
[12:28:30 INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Initialising converters for DataConverter...
[12:28:31 INFO]: [ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry] Finished initialising converters for DataConverter in 848.0ms
[12:28:31 INFO]: Starting minecraft server version 1.21.9
[12:28:31 INFO]: Loading properties
[12:28:31 INFO]: This server is running Paper version 1.21.9-59-main@0ff899d (2025-10-07T11:49:59Z) (Implementing API version 1.21.9-R0.1-SNAPSHOT)
[12:28:31 INFO]: [spark] This server bundles the spark profiler. For more information please visit https://docs.papermc.io/paper/profiling
[12:28:32 INFO]: Using 4 threads for Netty based IO
[12:28:32 INFO]: Server Ping Player Sample Count: 12
[12:28:34 INFO]: [MoonriseCommon] Paper is using 1 worker threads, 1 I/O threads
[12:28:34 INFO]: Default game type: SURVIVAL
[12:28:34 INFO]: Generating keypair
[12:28:34 INFO]: Starting Minecraft server on *:25565
[12:28:34 INFO]: Using epoll channel type
[12:28:34 INFO]: Paper: Using libdeflate (Linux x86_64) compression from Velocity.
[12:28:34 INFO]: Paper: Using OpenSSL 3.x.x (Linux x86_64) cipher from Velocity.
[12:28:35 INFO]: [InvSee++] Loading server plugin InvSeePlusPlus v0.30.11
[12:28:35 INFO]: [WorldEdit] Loading server plugin WorldEdit v7.3.17+7262-c7fbe08
[12:28:38 INFO]: Got request to register class com.sk89q.worldedit.bukkit.BukkitServerInterface with WorldEdit [com.sk89q.worldedit.extension.platform.PlatformManager@4a52fefb]
[12:28:38 INFO]: [InvSee++_Clear] Loading server plugin InvSeePlusPlus_Clear v0.30.11
[12:28:38 INFO]: [InvSee++_Give] Loading server plugin InvSeePlusPlus_Give v0.30.11
[12:28:38 INFO]: [Timber] Loading server plugin Timber v1.7.2
[12:28:38 INFO]: Server permissions file permissions.yml is empty, ignoring it
[12:28:38 INFO]: [WorldEdit] Enabling WorldEdit v7.3.17+7262-c7fbe08
[12:28:38 INFO]: Registering commands with com.sk89q.worldedit.bukkit.BukkitServerInterface
[12:28:38 INFO]: WEPIF: Using the Bukkit Permissions API.
[12:28:39 INFO]: Using com.sk89q.worldedit.bukkit.adapter.impl.v1_21_9.PaperweightAdapter as the Bukkit adapter
[12:28:42 INFO]: Preparing level "world"
[12:28:45 INFO]: Loading 0 persistent chunks for world 'minecraft:overworld'...
[12:28:45 INFO]: Preparing spawn area: 100%
[12:28:45 INFO]: Prepared spawn area in 24 ms
[12:28:45 INFO]: Loading 0 persistent chunks for world 'minecraft:the_nether'...
[12:28:45 INFO]: Prepared spawn area in 0 ms
[12:28:45 INFO]: Loading 0 persistent chunks for world 'minecraft:the_end'...
[12:28:45 INFO]: Preparing spawn area: 100%
[12:28:45 INFO]: Prepared spawn area in 5 ms
[12:28:45 INFO]: Done preparing level "world" (2.749s)
[12:28:45 INFO]: [InvSee++] Enabling InvSeePlusPlus v0.30.11
[12:28:45 INFO]: [InvSee++] Detected server software: Paper version 1.21.9
[12:28:46 INFO]: [InvSee++_Clear] Enabling InvSeePlusPlus_Clear v0.30.11
[12:28:46 INFO]: [InvSee++_Give] Enabling InvSeePlusPlus_Give v0.30.11
[12:28:46 INFO]: [Timber] Enabling Timber v1.7.2
[33;1m[12:28:46 WARN]: LogBlock isn't injected!
[12:28:46 WARN]: Install the plugin to improve tree detection
[12:28:46 WARN]:Download link: https://www.spigotmc.org/resources/blocklog.128909/ 
[12:28:46 INFO]: 
	Plugin Timber Update Available
	Your version: 1.7.2 | Latest: 1.7.5
	Download: https://www.curseforge.com/minecraft/bukkit-plugins/treetimber
[12:28:47 INFO]: [spark] Starting background profiler...
[12:28:47 INFO]: Starting remote control listener
[12:28:47 INFO]: Thread RCON Listener started
[12:28:47 INFO]: RCON running on 0.0.0.0:25575
[12:28:47 INFO]: Running delayed init tasks
[12:28:47 INFO]: Done (37.129s)! For help, type "help"

Relevant compose file:

services:
  nexus:
    image: itzg/minecraft-server
    tty: true
    stdin_open: true
    environment:
      EULA: "TRUE"
      MAX_MEMORY: 1G
      VERSION: "1.21.9"
      TYPE: PAPER
      PAPER_CHANNEL: experimental
      ENFORCE_WHITELIST: true
      WHITELIST: |
         [REDACTED]
      OPS: |
         [REDACTED]
      MODE: creative
      ACCEPTS_TRANSFERS: "true"
    volumes:
      - ./nexus:/data

  1-21-9-p-s:
    image: itzg/minecraft-server
    tty: true
    stdin_open: true
    environment:
      EULA: "TRUE"
      MAX_MEMORY: 3G
      VERSION: "1.21.9"
      TYPE: PAPER
      PAPER_CHANNEL: experimental
      ENFORCE_WHITELIST: true
      WHITELIST: |
         [REDACTED]
      OPS: |
         [REDACTED]
      MODE: survival
      ACCEPTS_TRANSFERS: true
    volumes:
      - ./1_21_9_P_S/:/data

  1-21-9-p-c:
    image: itzg/minecraft-server
    tty: true
    stdin_open: true
    environment:
      EULA: "TRUE"
      MAX_MEMORY: 4G
      VERSION: "1.21.9"
      TYPE: PAPER
      PAPER_CHANNEL: experimental
      ENFORCE_WHITELIST: true
      WHITELIST: |
         [REDACTED]
      OPS: |
         [REDACTED]
      MODE: creative
      ACCEPTS_TRANSFERS: true
    volumes:
      - ./1_21_9_P_C/:/data


  router:
    image: ${MC_ROUTER_IMAGE:-itzg/mc-router}
    depends_on:
      - nexus
      - 1-21-9-p-s
      - 1-21-9-p-c
    environment:
      DEBUG: true
      MAPPING: |
         [REDACTED]
    ports:
      - "25565:25565"

[SolusBellator]

Going to quickly re-run it with DEBUG enabled....

[itzg]

I can't tell where you think it's not set.

Also set DUMP_SERVER_PROPERTIES to "true" and see what file content gets dumped.

[SolusBellator]

server.properties file for the creative server in this setup as it was just generated.

#Minecraft server properties
#Fri Oct 31 23:51:37 UTC 2025 <<<<<<<<< From the restart I did a few minutes ago
accepts-transfers=false       <<<<<<<<< This line should be true!
allow-flight=false
broadcast-console-to-ops=true
broadcast-rcon-to-ops=true
bug-report-link=
debug=false
difficulty=easy
enable-code-of-conduct=false
enable-jmx-monitoring=false
enable-query=false
enable-rcon=true
enable-status=true
enforce-secure-profile=true
enforce-whitelist=true
entity-broadcast-range-percentage=100
force-gamemode=false
function-permission-level=2
gamemode=creative
generate-structures=true
generator-settings={}
hardcore=false
hide-online-players=false
initial-disabled-packs=
initial-enabled-packs=vanilla
level-name=world
level-seed=
level-type=minecraft\:normal
log-ips=true
management-server-enabled=false
management-server-host=localhost
management-server-port=0
management-server-secret=6qntNBo9w4fwSxhtE0MjaUJdA4jLzbFSUXsBZ3JM
management-server-tls-enabled=true
management-server-tls-keystore=
management-server-tls-keystore-password=
max-chained-neighbor-updates=1000000
max-players=20
max-tick-time=60000
max-world-size=29999984
motd=What could possibly go wrong...
network-compression-threshold=256
online-mode=true
op-permission-level=4
pause-when-empty-seconds=-1
player-idle-timeout=0
prevent-proxy-connections=false
query.port=25565
rate-limit=0
rcon.password=126a911995effa323a526fd0
rcon.port=25575
region-file-compression=deflate
require-resource-pack=false
resource-pack=
resource-pack-id=
resource-pack-prompt=
resource-pack-sha1=
server-ip=
server-port=25565
simulation-distance=10
spawn-protection=16
status-heartbeat-interval=0
sync-chunk-writes=true
text-filtering-config=
text-filtering-version=0
use-native-transport=true
view-distance=10
white-list=true

[SolusBellator]

For good measure, I changed the nexus server to adventure mode in the compose file:

#Minecraft server properties
#Sat Nov 01 00:00:43 UTC 2025      <<<< Just rebuilt
accepts-transfers=false            <<<< Still false
allow-flight=false
broadcast-console-to-ops=true
broadcast-rcon-to-ops=true
bug-report-link=
debug=false
difficulty=easy
enable-code-of-conduct=false
enable-jmx-monitoring=false
enable-query=false
enable-rcon=true
enable-status=true
enforce-secure-profile=true
enforce-whitelist=true
entity-broadcast-range-percentage=100
force-gamemode=false
function-permission-level=2
gamemode=adventure                 <<<< Changed!
generate-structures=true
generator-settings={}
hardcore=false
hide-online-players=false
initial-disabled-packs=
initial-enabled-packs=vanilla
level-name=world
level-seed=
level-type=minecraft\:normal
log-ips=true
management-server-enabled=false
management-server-host=localhost
management-server-port=0
management-server-secret=3KZ8F4rfWOtnwVmmUjPG812boKfcP4fveB3wZVVE
management-server-tls-enabled=true
management-server-tls-keystore=
management-server-tls-keystore-password=
max-chained-neighbor-updates=1000000
max-players=20
max-tick-time=60000
max-world-size=29999984
motd=What could possibly go wrong...
network-compression-threshold=256
online-mode=true
op-permission-level=4
pause-when-empty-seconds=-1
player-idle-timeout=0
prevent-proxy-connections=false
query.port=25565
rate-limit=0
rcon.password=1a74a7d27304cda748d572ee
rcon.port=25575
region-file-compression=deflate
require-resource-pack=false
resource-pack=
resource-pack-id=
resource-pack-prompt=
resource-pack-sha1=
server-ip=
server-port=25565
simulation-distance=10
spawn-protection=16
status-heartbeat-interval=0
sync-chunk-writes=true
text-filtering-config=
text-filtering-version=0
use-native-transport=true
view-distance=10
white-list=true

I also changed the "true" in the compose file from a string value to true and set the mode back to creative to ensure that the file has been updated:

#Minecraft server properties
#Sat Nov 01 00:04:57 UTC 2025     <<<<< Changed
accepts-transfers=false           <<<<< Still false
allow-flight=false
broadcast-console-to-ops=true
broadcast-rcon-to-ops=true
bug-report-link=
debug=false
difficulty=easy
enable-code-of-conduct=false
enable-jmx-monitoring=false
enable-query=false
enable-rcon=true
enable-status=true
enforce-secure-profile=true
enforce-whitelist=true
entity-broadcast-range-percentage=100
force-gamemode=false
function-permission-level=2
gamemode=creative                  <<<<< Changed!
generate-structures=true
generator-settings={}
hardcore=false
hide-online-players=false
initial-disabled-packs=
initial-enabled-packs=vanilla
level-name=world
level-seed=
level-type=minecraft\:normal
log-ips=true
management-server-enabled=false
management-server-host=localhost
management-server-port=0
management-server-secret=3KZ8F4rfWOtnwVmmUjPG812boKfcP4fveB3wZVVE
management-server-tls-enabled=true
management-server-tls-keystore=
management-server-tls-keystore-password=
max-chained-neighbor-updates=1000000
max-players=20
max-tick-time=60000
max-world-size=29999984
motd=What could possibly go wrong...
network-compression-threshold=256
online-mode=true
op-permission-level=4
pause-when-empty-seconds=-1
player-idle-timeout=0
prevent-proxy-connections=false
query.port=25565
rate-limit=0
rcon.password=f4261238e32c5783068e2e98
rcon.port=25575
region-file-compression=deflate
require-resource-pack=false
resource-pack=
resource-pack-id=
resource-pack-prompt=
resource-pack-sha1=
server-ip=
server-port=25565
simulation-distance=10
spawn-protection=16
status-heartbeat-interval=0
sync-chunk-writes=true
text-filtering-config=
text-filtering-version=0
use-native-transport=true
view-distance=10
white-list=true

So clearly it is updating the file, but seems to be refusing to set the transfers to true.

Could this be caused by Paper somehow?

[SolusBellator]

+ mc-image-helper set-properties --definitions /image/property-definitions.json /data/server.properties
[mc-image-helper] 00:04:25.103 DEBUG : Setting property gamemode to new value 'creative'
[mc-image-helper] 00:04:25.111 DEBUG : Setting property rcon.password to new value '***'
m[mc-image-helper] 00:04:25.114 INFO  : Created/updated 2 properties in /data/server.properties

This seems to be the relevant section from what I can make of the debug logs (having to remove the ASCII console characters is a little tedious)

As it seems, it only updated 2 proeprties:

• gamemode (which I had changed to easily see if the file was changed)
• rcon.password (I guess this has been randomised?)

Additional edit: I also tried to take a step back, setting ACCEPTS_TRANSFERS to false and to true again in the compose file, just to see whether Docker somehow missed that update and cached somethign weird, but still nothing happened.

[itzg]

I just noticed, you're running a very old image (from April). Always be sure to re-pull the image before reporting issues.

[init] Image info: buildtime=2025-04-19T02:44:43.813Z,version=java21,revision=0ec908b243d1ab435823f653b3777b408aea9e2f

Use

docker compose pull
docker compose up -d

[SolusBellator]

Wow I am incredibly sorry 🤦🏻‍♂️

So yeah, consider this a bug report that was delivered by UPS. Or Hermes, although it arrived...

I thought I had pulled recently. Seems I didn't. That was a different image on an entirely different server. Yikes.