// modpack server guide

Parasites: Reloaded server hosting & setup guide

A Parasites: Reloaded server needs Java 8 and about 2.5–4 GB of RAM for up to 8 players.

You're thrown into a post-nuclear world overrun by parasitic creatures focused on consuming what's left of humanity. The world will push you to your limits as you fight to survive against the relentless onslaught of these horrifying parasites.

Summary from Parasites: Reloaded on Modrinth.

By DSN Servers · Updated October 2026 · Forge · Minecraft 1.12.2 · Java Edition

Parasites: Reloaded is a Forge modpack for Minecraft 1.12.2 with 50 mods. We'd pick our Standard plan (4 GB) for it.

Quick facts

Loader	Forge
Minecraft versions	1.12.2
Java needed	Java 8 for Minecraft 1.12.2 Java version chart.
Mods	50 modsCounted from the pack's file list on Modrinth. None are marked client-only.
RAM	About 2.5–3 GB for 1–3 playersBy player count.
Downloads	750,167 on Modrinth
Last updated	July 4, 2024 (version 1.3.0)
First published	February 23, 2024 on Modrinth
Server support	Required: the pack has mods that must run on the server.
Server pack	Not published separatelyHow to build the server.
Modrinth tags	adventure, challenging, combat

Parasites: Reloaded server files

No. Parasites: Reloaded has no separate server pack on Modrinth, so the server is built from the .mrpack: the Forge server for Minecraft 1.12.2, plus the pack's overrides folder and the server-side mods its modrinth.index.json lists. A modpack installer does this for you; our guide shows how to make a server for a modpack with no server pack.

How much RAM does a Parasites: Reloaded server need?

Players online	RAM	DSN plan
1–3 players	About 2.5–3 GB	Standard (4 GB)
4–8 players	About 2.5–4 GB	Standard (4 GB)
9–15 players	About 3.5–5 GB	Premium (8 GB)Standard (4 GB) can do if players stay close.

Estimated from 50 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 -Xmx3500M on 4 GB. Forge 1.12.2 takes it in the java command (-Xmx), usually in the start script. RAM guide.

Parasites: Reloaded server requirements

Java	Java 8
Loader	Forge for Minecraft 1.12.2
CPU	Fast single-core speed (one main thread).
RAM	About 2.5–5 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 Parasites: Reloaded

Standard

4 GB RAM · planned launch price $16/month

At about 50 Forge mods this is a light pack, so 4 GB of RAM covers it for a small group.

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 Standard servers open.

Join the launch list Compare all plans

More than 8 players, or lots exploring at once? Go up to Premium (8 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 Parasites: Reloaded server on your own PC

What's specific to Parasites: Reloaded, step by step. The full walkthrough for any pack: how to make a modded Minecraft server.

Install Java 8.
Check with java -version. Java version chart.
Get the server files.
Build them from the .mrpack, as in server files above.
Start it and accept the EULA.
Run the start script in the server files, or java -jar on the Forge jar the installer made, then set eula=true in eula.txt if 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 Parasites: Reloaded on DSN

Once we relaunch (join the launch list), on DSN you'd install Parasites: Reloaded from the panel's Modrinth modpack installer (version 1.3.0), pick Java 8 on the Startup tab and accept the EULA in the console. No port forwarding.

How to play Parasites: Reloaded with friends

Each player installs Parasites: Reloaded version 1.3.0 with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.

Different versions of Parasites: Reloaded 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 Parasites: Reloaded

Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once Parasites: Reloaded has enough (tick lag guide). For Parasites: Reloaded:

Distances: view-distance=8 in server.properties.
Pre-generate: with a pregeneration mod built for 1.12.2, before people explore.

Common Parasites: Reloaded crashes

What a Forge 1.12.2 server running Parasites: Reloaded hits most. For any other error, paste the log into the free crash log analyzer.

Wrong Java version. Forge for 1.12.2 won't start on anything newer than Java 8, and stops with ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader. Java version fix.
Out of memory. Parasites: Reloaded (50 mods on the server) needs about 2.5–3 GB for 1–3 players; java.lang.OutOfMemoryError means it ran out. Out-of-memory fix.
Client-only mod on the server. The Parasites: Reloaded pack file marks none of its mods client-only, so this usually means one was copied over from a player's mods folder. 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 Parasites: Reloaded by hand usually crash it with a missing dependency: net.minecraftforge.fml.common.MissingModsException names the mod.
Ticking entity or block entity. The crash report names it and gives its coordinates. Ticking entity fix.

Updates and support

Before moving Parasites: Reloaded past version 1.3.0, back up the world: see updating a modpack server without losing your world.

Bugs in Parasites: Reloaded itself go to its authors: Discord. Server problems on DSN: hello@dsnservers.com or Discord.

More: all modpack guides and how to make a modded server.

Run Parasites: Reloaded on DSN when we relaunch.

Our pick, Standard: 4 GB, planned at $16/month.

Join the launch list

DSN Servers isn't affiliated with Parasites: Reloaded or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).