// modpack server guide
BlockFront server hosting & setup guide
A BlockFront server needs Java 21 and about 2–3.5 GB of RAM for up to 15 players.
Featuring guns, explosives, vehicles, and more, BlockFront is an action-packed Minecraft mod that lets players immerse themselves in realistic World War II combat.
Summary from BlockFront on Modrinth.
BlockFront is a NeoForge modpack for Minecraft 1.21.1 with 2 mods, 1 of which runs on the server. We'd pick our Standard plan (4 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 | 1 runs on the server2 in the pack. The other one is client-only, and the server skips it. |
| RAM | About 2 GB for 1–3 playersBy player count. |
| Downloads | 450,761 on Modrinth |
| Last updated | October 2, 2026 (version 0.9.0.38b) |
| First published | December 12, 2023 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 | challenging, combat, quests, technology |
BlockFront server files
No. BlockFront has no separate server pack on Modrinth, so the server is built from the .mrpack: the NeoForge server for Minecraft 1.21.1, 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 BlockFront server need?
| Players online | RAM | DSN plan |
|---|---|---|
| 1–3 players | About 2 GB | Standard (4 GB) |
| 4–8 players | About 2–2.5 GB | Standard (4 GB) |
| 9–15 players | About 2–3.5 GB | Standard (4 GB) |
Estimated from 1 mod 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. NeoForge 1.21.1 reads it from user_jvm_args.txt: uncomment the -Xmx line. RAM guide.
BlockFront server requirements
| Java | Java 21 |
|---|---|
| Loader | NeoForge for Minecraft 1.21.1 |
| CPU | Fast single-core speed (one main thread). |
| RAM | About 2–3.5 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 BlockFront
Standard
4 GB RAM · planned launch price $16/month
At about 1 NeoForge mod 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.
More than 15 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 BlockFront server on your own PC
What's specific to BlockFront, 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.
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 the
run.sh/run.batthe NeoForge 1.21.1 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 BlockFront on DSN
Once we relaunch (join the launch list), on DSN you'd install BlockFront from the panel's Modrinth modpack installer (version 0.9.0.38b), pick Java 21 on the Startup tab and accept the EULA in the console. No port forwarding.
How to play BlockFront with friends
Each player installs BlockFront version 0.9.0.38b with the Modrinth App or Prism Launcher, the same version as the server, and adds the server's address under Multiplayer.
Different versions of BlockFront 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 BlockFront
Can't keep up! Is the server overloaded? means ticks take longer than 50 ms; more RAM won't fix that once BlockFront has enough (tick lag guide). For BlockFront:
- 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.
Common BlockFront crashes
What a NeoForge 1.21.1 server running BlockFront hits most. For any other error, paste the log into the free crash log analyzer.
- Wrong Java version. BlockFront 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. - Out of memory. BlockFront (1 mods on the server) needs about 2 GB for 1–3 players;
java.lang.OutOfMemoryErrormeans it ran out. Out-of-memory fix. - Client-only mod on the server. BlockFront includes 1 client-only mod, which a server install skips; copying a player's mods folder brings it 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 BlockFront 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 BlockFront past version 0.9.0.38b, back up the world: see updating a modpack server without losing your world.
Bugs in BlockFront itself go to its authors: wiki and Discord. Server problems on DSN: hello@dsnservers.com or Discord.
Packs like BlockFront
More: NeoForge server hosting, all modpack guides and how to make a modded server.
Run BlockFront on DSN when we relaunch.
Our pick, Standard: 4 GB, planned at $16/month.
DSN Servers isn't affiliated with BlockFront or Modrinth. The pack's name, icon, summary and stats come from Modrinth's public API (checked October 4, 2026).