// modpack server guide
All the Mons server hosting & setup guide
An All the Mons server needs Java 21 and about 10–12 GB of RAM for up to 8 players.
All the Mods 10 with Cobblemon built in, on NeoForge 1.21.1: ATM10's tech and magic progression plus Pokémon quests, custom trainer battles and structures, ending in an ATM Star that needs both modded and Pokémon resources.
Pack details checked by hand against All the Mons on CurseForge on October 5, 2026.
All the Mons is a NeoForge modpack for Minecraft 1.21.1 with 396 mods. We'd pick our Heavy plan (12 GB) for it.
Quick facts
| Loader | NeoForge |
|---|---|
| Minecraft versions | 1.21.1 |
| Java needed | Java 21 for Minecraft 1.21.1 Java version chart. |
| Mods | 396 modsThe number of mods CurseForge lists for the pack, client-side ones included; the authors say over 400. |
| RAM | About 9–10 GB for 1–3 playersBy player count. |
| Downloads | 2,034,745 on CurseForgeAs of October 5, 2026. |
| Latest version | September 6, 2026 (version 1.3.0)The newest version when we checked on October 5, 2026. |
| Official server files | Download pagePublished next to most versions on CurseForge, for example ServerFiles-1.3.0.zip for version 1.3.0. |
| Where to get it | All the Mons on CurseForge |
| Tags | extra large, adventure and rpg, quests, magic, tech |
All the Mons server files
All the Mons's authors publish official server files. Published next to most versions on CurseForge, for example ServerFiles-1.3.0.zip for version 1.3.0. Get the official server files.
Use the server files for the exact version your players install: a server and client on different pack versions won't connect.
How much RAM does an All the Mons server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 9–10 GB | Heavy (12 GB) |
| 4–8 players | About 10–12 GB | Heavy (12 GB) |
| 9–15 players | About 11.5–15 GB | Heavy (12 GB) if players stay closeMore than 12 GB if they spread out. |
Estimated from 396 mods with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
With 9–15 players spread across the map, All the Mons can need more than 12 GB, our biggest plan. A lower view distance and a pre-generated world help it fit; past that, a host with bigger plans is the better choice.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx10500M on 12 GB. NeoForge 1.21.1 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
All the Mons server requirements
| Java | Java 21 |
|---|---|
| Loader | NeoForge for Minecraft 1.21.1 |
| CPU | Fast single-core speed (one main thread). With 396 mods, the first start takes minutes. |
| RAM | About 9–15 GB for 1–15 players (table above) |
| Disk | The server files, a growing world and backups |
| Network | TCP port 25565 open to players |
Recommended plan
Our pick for All the Mons
Heavy
12 GB RAM · planned launch price $42/month
With 396 mods on CurseForge's list, ATM10 plus Cobblemon, this is one of the biggest packs you can run, and 12 GB keeps it clear of out-of-memory crashes.
Ordering is closed until we relaunch. We aren't taking orders or payments while we move to new hardware. Join the launch list and we'll email you when Heavy servers open.
Heavy is our biggest plan. Not sure? Email hello@dsnservers.com.
Planned launch price in USD, billed monthly once ordering opens, with a 7-day refund window.
How to make an All the Mons server on your own PC
What's specific to All the Mons, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 21.
Check with
java -version. Java version chart. - Get the server files.
Download the official server files for the version your players use and unzip them into an empty folder. Follow the readme that comes with them.
- Start it and accept the EULA.
Run the start script in the server files, or the
run.sh/run.batthe NeoForge 1.21.1 installer writes, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). With 396 mods, the first start takes minutes. - Set the RAM with
-Xmx, sized from the table above. - Let friends connect: forward TCP 25565, or use a tunnel or host behind CGNAT (can't connect?).
Or run All the Mons on DSN
Once we relaunch (join the launch list), on DSN you'd install All the Mons from the panel's CurseForge modpack installer, pick Java 21 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play All the Mons with friends
Each player installs All the Mons with the CurseForge app or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of All the Mons on the server and a client show up as Mismatched mod channel list or mod rejections. Why friends can't join, timeouts included.
Lag and performance on All the Mons
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once All the Mons has enough (tick lag guide). For All the Mons:
- Measure first: spark's
/spark tpsand profiler work on 1.21.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.21.1,
/chunky radius 3000then/chunky start, before people explore. - Chunk loaders keep machines running with nobody nearby; in a pack this size, dozens add up.
Common All the Mons crashes
What a NeoForge 1.21.1 server running All the Mons hits most. For any other error, paste the log into the free crash log analyzer.
- Out of memory. All the Mons (396 mods) needs about 9–10 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Wrong Java version. All the Mons on Minecraft 1.21.1 needs Java 21. Started on Java 17, it stops with
UnsupportedClassVersionError: ... class file version 65.0, this version of the Java Runtime only recognizes class file versions up to 61.0. Java version fix. - Client-only mod on the server. This one shows up when the mods folder is copied from a player's game instead of installed as a server. Check a mods list with the client-or-server-side checker. Client-only mod fix.
- After adding or updating a mod. Mods you add to All the Mons by hand usually crash it with a missing dependency or a mixin conflict.
- Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.
Updates and support
Before moving All the Mons past version 1.3.0, back up the world: see updating a modpack server without losing your world.
Bugs in All the Mons itself go to its authors: issue tracker. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like All the Mons
More: Cobblemon server hosting, all modpack guides and how to make a modded server.
Run All the Mons on DSN when we relaunch.
Our pick, Heavy: 12 GB, planned at $42/month.
DSN Servers isn't affiliated with All the Mons or CurseForge. We wrote the summary and checked the pack's facts by hand on October 5, 2026. Sources: curseforge.com, curseforge.com (2), curseforge.com (3), curseforge.com (4), api.cfwidget.com, github.com.