Do my players need the same mods as the server?

Yes — apart from a handful of server-side mods, players must run exactly the same mods as the server. Launchers such as the official DayZ Launcher see which mods your server uses and download them automatically via the Steam Workshop.

Why are players being rejected after I installed a mod?

Usually the mod's bikey is missing from the server's keys folder. Copy the .bikey file from the mod's keys folder to your server's keys folder and restart. A version mismatch between server and player has the same effect.

What is CF (Community Framework) and why must it load first?

CF is a framework that many popular DayZ mods build on. Because those mods use CF's functions, CF must be at the front of the -mod parameter, before all mods that need it. Put it in the wrong place and the server crashes or mods fail to load.

Can I take my modded DayZ server back to vanilla?

Yes: remove the mods from the launch parameters, delete the mod folders and keys and restart. Bear in mind that all modded items disappear from the world; after a long modded run, a fresh wipe is often the cleanest solution.

// DayZ

Installing DayZ mods from the Steam Workshop

24 August 2026 · 4 min read

Vanilla DayZ has a charm of its own: scarcity, tension and a world that makes no allowances for you whatsoever. But anyone who plays with a group for a while ends up at the Steam Workshop sooner or later. It holds thousands of mods, from complete new maps to small improvements that make life in Chernarus just that bit more pleasant. Installing mods on your server is thankfully not rocket science, but there are two classic pitfalls — the keys folder and the load order — that almost everyone falls into once. This guide steers you right around them.

How DayZ modding works via the Steam Workshop

All DayZ mods live on the Steam Workshop. Subscribe to a mod and Steam automatically downloads it to your PC, into a folder whose name starts with an at sign, such as @CF. That folder contains the actual mod files plus — for virtually every serious mod — a folder with key files, more on those in a moment.

Important to understand: in DayZ, a mod almost always runs in two places at once. The server loads the mod so it knows about the new items, vehicles or buildings, and every player loads exactly the same mod to be able to see them. A handful of mods are purely server-side (think admin tools), but assume by default that server and players need the same files, in the same version.

Getting mods onto your server

Adding them boils down to three steps:

Put the mod folder on the server. Upload the complete @Modnaam folder to your server's root directory, for example via SFTP (how to connect via SFTP). Many panels also have a Workshop installer that does this for you.
Add the mod to the launch parameters. DayZ loads mods via the -mod parameter, with semicolons between the mods: -mod=@CF;@JouwTweedeMod;@JouwDerdeMod. No spaces around them, and the order is not arbitrary — more on that below.
Copy the keys. The step everyone forgets, which is why it gets its own heading below.

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The keys folder: the step everyone forgets

By default, DayZ servers check whether the mods of connecting players are digitally signed. Every serious mod ships a key file for exactly that: a .bikey, usually in a folder called keys or Keys inside the mod folder. You copy that file into the keys folder in your server's root directory.

Forget this and the symptom is always the same: the server starts fine, but players are rejected on connecting with a message that their files were not accepted. This is by far the most asked question around modded DayZ servers, and the answer is almost always: forgot the bikey. The reverse applies too: when you remove a mod, clean up its key. That way your server no longer accepts files that shouldn't be there any more.

Your players need the same mods

Sounds like a hassle, but in practice it's fine: launchers handle this almost automatically these days. The official DayZ Launcher sees which mods your server runs, and players grab any missing mods with one click via the Workshop. All you have to do is make sure your mod list is correct and that your server was started with exactly those mods.

Do keep that list manageable, though. Every extra mod means more downloading for new players, more chance of conflicts and more maintenance for you. Ten well-chosen mods give a better experience than forty that are half at war with each other — and a smaller mod list makes the barrier to giving your server a try a lot lower.

Load order: CF first, then the rest

The order in your -mod parameter is the order in which mods load, and that matters a great deal as soon as mods depend on each other. The best-known dependency is CF (Community Framework): dozens of popular mods build on it, so CF belongs at the front of your list, before everything that needs it.

Which dependencies a mod has is shown on its Workshop page under the listed required items. The rule of thumb: frameworks and libraries first, then the mods that lean on them, and for big overhaul or map mods you follow the order the creator recommends. If it goes wrong, you'll notice straight away: the server crashes on startup or throws errors into the logs about components it cannot find. Move the dependency forward in the list and restart.

Mod updates: the silent server killers

This is where things go wrong most often on live servers. After every DayZ patch, mod authors update their mods, and Steam pushes those updates straight to your players' PCs. At that moment your server still has the old version — and a version mismatch between server and client means rejected players or a server that refuses to start.

A few habits that protect you against this:

Expect work after every game update: check whether your mods have been updated and update the server copies (or let your panel do it).
Make a backup of your server before every mod update, including the mission folder with your loot and spawn settings.
Know that big mods sometimes lag days behind a game patch. Simply communicate that to your players instead of frantically trying half-baked fixes.

What types of mods are there?

Roughly four flavours, each with its own impact on your server:

Maps. Complete new worlds. By far the heaviest category: a new map also means a new mission folder and a loot economy that has to be tuned all over again.
Loot and gear mods. More weapons, clothing, vehicles or tools. Don't forget that new items also have to be added to the loot tables, otherwise they simply never spawn.
Quality-of-life. A better interface, handier inventory management, maps and compasses that are nicer to use. Small downloads, big effect, little risk.
Admin and server tools. Often (partly) server-side, and indispensable once you want to moderate seriously or organise events.

Back to vanilla

If you want rid of your mods, the technique is simple: take them out of the -mod parameter, delete the mod folders and clean up the matching keys. But think about your world first. All the modded items players have collected — weapons, tents, vehicles, entire bases — no longer exist after removal and disappear from the saved world. For a small QoL mod that's no drama; after months on a heavily modded server, a clean wipe is often fairer and more stable than a world full of holes. In both cases, make a full backup first, so you can always go back.