// modpack server guide
Cave Horror Project 1 server hosting & setup guide
A Cave Horror Project 1 server needs Java 17 and about 5.5–7 GB of RAM for up to 8 players.
Forge 1.20.1 | Chapter 6 is out! | Best horror modpack with quests and story! PLAY NOW!
Summary from Cave Horror Project 1 on Modrinth.
Cave Horror Project 1 is a Forge modpack for Minecraft 1.20.1 with 165 mods, 145 of which run on the server. We'd pick our Premium plan (8 GB) for it.
Quick facts
| Loader | Forge |
|---|---|
| Minecraft versions | 1.20.1 |
| Java needed | Java 17 for Minecraft 1.20.1 Java version chart. |
| Mods | 145 run on the server165 in the pack. The other 20 are client-only, and the server skips them. |
| RAM | About 5–5.5 GB for 1–3 playersBy player count. |
| Downloads | 1,888,817 on Modrinth |
| Last updated | October 1, 2026 (version v3.6.1) |
| First published | August 17, 2024 on Modrinth |
| Server support | Required: the pack has mods that must run on the server. |
| Server pack | Cave Horror Project 1 v3.6.1 Server Pack.zipOfficial server pack on CurseForge, for Cave Horror Project 1 v3.6.1, the same version Modrinth has. Checked October 5, 2026. |
| Modrinth tags | adventure, challenging, combat |
Cave Horror Project 1 server files
Yes, on CurseForge. Modrinth has no separate server pack for Cave Horror Project 1, but the authors publish one on CurseForge: Cave Horror Project 1 v3.6.1 Server Pack.zip, for Cave Horror Project 1 v3.6.1 (October 1, 2026). That's the same version Modrinth has.
How much RAM does a Cave Horror Project 1 server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 5–5.5 GB | Premium (8 GB) |
| 4–8 players | About 5.5–7 GB | Premium (8 GB) |
| 9–15 players | About 6.5–9 GB | Heavy (12 GB)Premium (8 GB) can do if players stay close. |
Estimated from 145 mods on the server with our RAM calculator, not measured: low end if players stay together, high end if they spread out.
Set Java's heap (-Xmx) 10–15% under the RAM you have, about -Xmx7000M on 8 GB. Forge 1.20.1 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
Cave Horror Project 1 server requirements
| Java | Java 17 |
|---|---|
| Loader | Forge for Minecraft 1.20.1 |
| CPU | Fast single-core speed (one main thread). |
| RAM | About 5–9 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 Cave Horror Project 1
Premium
8 GB RAM · planned launch price $30/month
At about 145 Forge mods this is a mid-size pack, and 8 GB gives it room for the mods plus the chunks your players load.
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 Premium servers open.
More than 8 players, or lots exploring at once? Go up to Heavy (12 GB). 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 a Cave Horror Project 1 server on your own PC
What's specific to Cave Horror Project 1, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.
- Install Java 17.
Check with
java -version. Java version chart. - Get the server files.
Download the official server pack,
Cave Horror Project 1 v3.6.1 Server Pack.zip, from CurseForge and unzip it into an empty folder. - Start it and accept the EULA.
Run the start script in the server files, or the
run.sh/run.batthe Forge 1.20.1 installer writes, then seteula=trueineula.txtif you accept Mojang's EULA (EULA step). - 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 Cave Horror Project 1 on DSN
Once we relaunch (join the launch list), on DSN you'd install Cave Horror Project 1 from the panel's Modrinth modpack installer (version v3.6.1), pick Java 17 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play Cave Horror Project 1 with friends
Each player installs Cave Horror Project 1 version v3.6.1 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of Cave Horror Project 1 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 Cave Horror Project 1
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Cave Horror Project 1 has enough (tick lag guide). For Cave Horror Project 1:
- Measure first: spark's
/spark tpsand profiler work on 1.20.1 and name the mod or machine using the tick time. - Distances:
view-distance=8and a lowersimulation-distanceinserver.properties. - Pre-generate: Chunky for 1.20.1,
/chunky radius 3000then/chunky start, before people explore.
Common Cave Horror Project 1 crashes
What a Forge 1.20.1 server running Cave Horror Project 1 hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. Cave Horror Project 1 on Minecraft 1.20.1 needs Java 17. Started on Java 8, it stops with
UnsupportedClassVersionError: ... class file version 61.0, this version of the Java Runtime only recognizes class file versions up to 52.0. Java version fix. - Out of memory. Cave Horror Project 1 (145 mods on the server) needs about 5–5.5 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. Cave Horror Project 1 includes 20 client-only mods, which a server install skips; copying a player's mods folder brings them back and stops the 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 Cave Horror Project 1 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 Cave Horror Project 1 past version v3.6.1, back up the world: see updating a modpack server without losing your world.
Bugs in Cave Horror Project 1 itself go to its authors: wiki and Discord. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like Cave Horror Project 1
More: all modpack guides and how to make a modded server.
Run Cave Horror Project 1 on DSN when we relaunch.
Our pick, Premium: 8 GB, planned at $30/month.
DSN Servers isn't affiliated with Cave Horror Project 1 or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).