Guides / Multiplayer
How to Play Project Zomboid Multiplayer With Friends (IP + Port)
Project Zomboid is best with a group of survivors. This guide explains how Project Zomboid multiplayer works, how your server address and port connect your friends to your world, and why a dedicated server makes surviving together far smoother. Project Zomboid on Flux supports up to 32 players, scaling with your plan.
How Project Zomboid multiplayer works
Project Zomboid multiplayer is address based. Whoever runs the world - either a player hosting from their game, or a dedicated server - has an address (IP or domain) and a port (default 36261), plus an optional server password. Friends enter that address to join. There are no invite codes: you just share your address, port and password. On a properly hosted server there is no manual home-router port forwarding for the people joining.
Joining a Project Zomboid server, step by step
- Wait for the server to come online, then grab its address (IP or domain) and port from the host or the hosting dashboard.
- Share the address + port (and the password, if one is set) with your friends.
- Open Project Zomboid and choose Join.
- Add the server to Favorites or use direct connect, enter the address, port and password, then spawn into your persistent Knox County.
Why use a dedicated server for multiplayer?
If you host from your own game, the world closes when you leave and everyone's progress pauses. A dedicated server keeps your Knox County world online 24/7, so friends in other time zones can log in whenever they want and keep progressing even when you're offline - no lost sessions. Our Flux servers auto-open the required ports, so nobody needs to touch a home router. There is full Steam Workshop mod support too - friends just need the same mods, and the server tells the client what to download. It also gives the host admin tools via the dashboard and RCON - live map, settings and backups - for a smoother group experience. You can spin one up in about 30 seconds; see the setup guide.
When a friend cannot connect
Nearly every failed join comes down to one of four things, and they are quick to tell apart:
- A mod mismatch. The server sends its mod list, but each player still needs the files locally. If one person is missing a mod — or has an older copy of one that just updated — they alone get rejected while everyone else plays fine. Have them subscribe on the Steam Workshop and let Steam finish downloading. The mods guide covers version mismatches in detail.
- The wrong address or port. Project Zomboid uses 36261/UDP by default. Share the server address exactly as the dashboard shows it, port included.
- The password. If you set a join password at deploy, it only takes effect after the first restart — a fresh server can reject a correct password until it has cycled once.
- The server is still starting. After a mod change the server downloads Workshop items on the next couple of restarts. Give it a moment before assuming something is broken.
If everyone is failing rather than one person, it is almost never the client — check the server is actually running from the dashboard, where you can also read the log and use the RCON console to broadcast a message to whoever did get in.
Latency, and why the region you pick matters
Project Zomboid is more forgiving of latency than a shooter, but not immune to it: melee timing, looting and vehicles all feel worse on a distant server, and a high-ping player will notice zombies appearing to rubber-band. Because Flux spans 50+ countries, the fix is usually just choosing the right region at deploy — pick one close to the bulk of your group rather than to whoever happens to be setting the server up. A mixed European and North American group will always be a compromise; place the world where most of the play happens, and the minority will still be perfectly playable.
Keeping a group world healthy
A shared world lives or dies on two habits. First, settle the mod list before the run starts: adding or removing map and overhaul mods mid-save can corrupt chunks that players have already explored. Second, take a backup before you change anything — the dashboard has backups and one-click restore built in, and the moment before a mod update is exactly when you will want one. Beyond that, difficulty is set with sandbox presets (Apocalypse, Survivor, Builder) at deploy, so agree on one with the group rather than changing it under them later.
Multiplayer FAQ
How do I invite friends to my Project Zomboid server?
Share your server's address (IP or domain) and port (default 36261), plus the password if you set one. Friends open Project Zomboid, choose Join, add your server, and enter the address.
Why can't my friends connect?
Usually a wrong address or port, a missing or incorrect server password, the server still booting, or a mod mismatch. Confirm the address:port and password, wait for the server to report online, and make sure everyone has the same mods and latest Project Zomboid build.
How many friends can join?
Up to 32 players, scaling with your plan. Plans are sold as 8, 16 and 32 slots - pick a larger plan for bigger groups and heavier mod loads.