Project Zomboid: The Host Must Allow You To Join (and 3 Ways In)

How to Join Friends in Project Zomboid

Joining a friend's Project Zomboid server has three reliable paths. The simplest is the Steam invite - it auto-whitelists you on the destination server, no IP or password needed. For details on direct-IP joins, see our existing How to Join a Server guide.

"The host must allow you to join": what it means

This is the most common message people hit, and it is not a bug, a firewall problem or a mod mismatch. It means the server is running closed, and your account is not on its whitelist yet.

The setting behind it is Open, and the game documents it in its own server option list like this:

"Clients may join without already having an account in the whitelist. If set to false, administrators must manually create username/password combos."

So there are exactly two ways past it, and both are the host's to do, not yours:

1. The host invites you in-game. Method 2 below. This adds you to the whitelist automatically and is the fastest fix by a long way.
2. The host sets Open=true in the server config and restarts. Anyone may then join and create their own account on first connect. Pair it with Password if you still want the server private: the game's own note is "Clients must know this password to join the server", and a password plus Open is the usual setup for a friends-only server that does not need manual whitelisting.

Nothing you do on your machine will change this. Reinstalling, verifying files, port forwarding and restarting Steam all leave it exactly where it was, because the check happens on the server against its whitelist.

Method 1 - Steam Invite (Easiest)

1. Have your friend launch their server or join one as a player.
2. Open Project Zomboid on your end (or close it - see the note below).
3. Press Shift + Tab to open the Steam Overlay.
4. Find your friend in the friends list - Project Zomboid should appear next to their name.
5. Click Join Game.

Method 2 - In-Game Invite Friend (Auto-Whitelist)

This is the host's side of the workflow. Useful when your server requires whitelisting:

1. The host opens the game and connects to their server.
2. Press ESC to open the in-game menu.
3. Click Invite Friend.
4. Pick the friend from the Steam list. The friend gets a Steam invite popup.
5. The friend clicks Accept. The game launches with auto-whitelist parameters.

This is the only invite path that works on whitelisted servers without the host running an admin command.

Method 3 - Server Browser by Name

Use this if your friend's server is public and you don't have them on Steam:

1. From the main menu, click JOIN.
2. Click the Internet tab at the top.
3. In the bottom-left Name Filter box, type the server name your friend gave you.
4. Highlight the server in the list and click Join Server.

If You Get "Account Username/Password" Prompt

The first time you connect to a server, Project Zomboid asks for an Account Username (your in-game character name on that server) and an Account Password (set by you, used on every return). This is per-server, not your Steam account. Forgotten the password? The server admin must delete your player file before you can rejoin.

Common "Why Can't I Join My Friend" Issues

Group up. Host a Project Zomboid server with Supercraft and your friends can join via one-click Steam invite.

Planning where to regroup? Use the interactive Knox Country map to pick a meetup town before everyone spawns in - all starter towns, compared.