Setting up a Minecraft server is usually a headache, but trying to run Aternos Solo Leveling Reawakening is a whole different level of pain. You've probably been there. You find this incredible modpack by ProFake, see the S-rank gates, the shadow extraction, and the insane leveling system, and you think: "I need to play this with the boys." Then you hit the "Start" button on Aternos and... nothing. Or worse, it crashes every ten minutes.
It’s frustrating.
The reality is that Solo Leveling Reawakening is one of the most resource-heavy packs out there for version 1.20.1. It isn't just "another RPG mod." It's a massive overhaul that changes how Minecraft handles entity data and world generation. If you're trying to host this on a free tier, you're basically asking a bicycle to carry a semi-truck's load.
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The Aternos Solo Leveling Reawakening Compatibility Wall
Let’s be real for a second. Aternos is great because it’s free, but it has strict limits. Most Aternos servers cap out at around 2GB to 2.4GB of RAM. Now, look at the requirements for Solo Leveling Reawakening. The author, ProFake, explicitly recommends a minimum of 8GB of RAM for a smooth multiplayer experience.
See the problem?
When you try to run Aternos Solo Leveling Reawakening, the server has to load over 100 mods, handle complex "Gate" dimensions, and track the "System" stats for every player. This causes a massive "tick lag" where the server can't keep up with the game logic. If you manage to get it running, you’ll likely see the dreaded "Can't keep up!" message in your console before the whole thing just gives up.
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Why does it crash on startup?
Usually, it's the "Incompatible Mod" error or a simple memory exhaustion. Since Aternos doesn't allow you to manually adjust the JVM arguments (the hidden settings that tell Minecraft how to use memory), you're stuck with their default profile. If the pack includes heavy optimization mods that conflict with Aternos’s specific wrapper, the server won't even boot.
I've seen plenty of players on Reddit and Discord complaining about the "Registry Data" error. This happens when the server and your computer don't agree on what mods are actually installed. Because Aternos sometimes lacks the very latest "Server Pack" version that matches the CurseForge client, you get a version mismatch.
How to Actually Get It Working (Sorta)
If you're dead set on using Aternos for this specific pack, you have to be smart about it. You can't just click "Install" and hope for the best.
First, check if the modpack is officially in the Aternos library. If it isn't, you can't just upload the .zip file from CurseForge—Aternos doesn't allow custom modpack uploads for security reasons. You have to request it through their forums, but they usually reject packs that require more than 4GB of RAM because they know their hardware can't handle it.
- Software Selection: Make sure you are using Forge 1.20.1 (matching the pack version).
- The "Shadow" Problem: The Shadow Extraction mechanic creates a lot of entities. If three of you are playing and everyone has ten shadows out, the Aternos CPU will melt. Keep your shadow army small.
- Pre-generate the World: This is a pro tip. Use a plugin or mod like Chunky to pre-generate the world chunks while no one is online. Loading new chunks while fighting a boss is the #1 cause of server crashes.
The Modpack Confusion
There's a lot of noise online because ProFake actually has multiple packs: Solo Leveling - Shadows, Solo Leveling - Level Up, and Solo Leveling - Reawakening. Reawakening is the most polished but also the heaviest. If you find Reawakening is just too much for your server, "Shadows" is a slightly lighter alternative that might actually stay online for more than twenty minutes.
Is There a Better Way?
Honestly? Yes.
If you want the full experience of Aternos Solo Leveling Reawakening—meaning you want to enter S-Rank gates without the server lagging into the shadow realm—you might have to look beyond the free tier. Free hosting is amazing for vanilla or light modsets like Skyblock. But Solo Leveling is an "Overworld RPG" pack. These are notorious for being "heavy."
When you enter a Gate in the mod, the game has to generate a whole new dimension. On a limited server, this causes a "Lag Spike of Death." If you're playing solo, just play on your own PC. Most modern gaming rigs have 16GB of RAM, which is plenty to allocate 8GB to the game.
But if you have to play with friends, and Aternos is your only option:
- Lower the View Distance: Set it to 4 or 6. It looks like garbage, but it saves the CPU.
- Disable Decorative Mods: If you can access the files, remove things like "Ambient Sounds" or "Better Foliage." They don't affect gameplay but eat up precious memory.
- Limit Players: Don't try to get five people on an Aternos server with this pack. Two is the limit before things get weird.
Actionable Insights for Hunters
Stop banging your head against the wall. If the server keeps crashing, check the Log tab in your Aternos dashboard. Look for "OutOfMemoryError." If you see that, no amount of "fixing" will help—the pack is simply too big for the container.
Your best bet is to either find a lighter version of the mod (there are many "Solo Leveling" individual mods that don't come in a heavy pack) or use the "Essential Mod." The Essential Mod allows you to host a world directly from your computer and invite friends through your social list, bypassing the need for a third-party server entirely. It uses your PC's power instead of Aternos's limited resources.
Go into your CurseForge settings, allocate 8GB of RAM to your Minecraft instance, install the Essential Mod, and just invite your friends. It’s faster, it’s free, and it won't crash when you finally extract your first boss shadow.
To make this work, everyone needs to have the exact same version of Solo Leveling Reawakening installed on their own computers. Check the version number in the bottom corner of your launcher—if one person is on 1.6.6 and another is on 1.6.8, you're going to have a bad time. Match those versions, use the Essential Mod to host, and you’ll actually get to play the game instead of staring at a "Server Offline" screen.