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GuidesGuidesWhen someone can't get in, the client usually says why in one short line. Decode the whitelist, version-mismatch, server-full, wrong-address, and online-mode messages — and match each to the exact fix.
A player stuck on the "Can't connect" screen almost always has a one-line reason printed right there in red. This guide maps the messages you'll actually see to their causes — and to the panel page that fixes each one.
| At a glance | |
|---|---|
| You need | Your Minecraft server's address from the Network page |
| First check | Is the server actually online? (Free servers stop when empty — see below) |
| Then | Read the player's exact error and find it in the table |
| The player sees | Cause | Fix |
|---|---|---|
| "You are not white-listed on this server!" | Whitelist is on and they're not on it | Add them on the Players page (Whitelist tab), or turn white-list off on the Properties page |
| "Outdated server! I'm still on " | The server runs an older version than their client | Have them select that version in their launcher, or update the server in the Version Changer |
| "Outdated client! Please use " | The server runs a newer version than their client | They update their client to the version shown |
| "The server is full!" | max-players reached |
Raise max-players on the Properties page |
| "Failed to verify username!" / "Invalid session" | Online-mode mismatch (a cracked/offline client on an online server) | See online-mode, below — decide online vs cracked for the whole server |
| "Connection timed out" / "Connection refused" / "Can't resolve hostname" | Wrong address/port, or the server is offline | Check the address (below) and that the server is running |
| "This server requires Forge/Fabric" / "missing mod" | Modded server; the player lacks the loader + matching mods | They install the same loader and mod set — see Mods & modpacks |
More "can't join" reports are wrong-address than anything else, and the right form depends on the platform:
yourname.falixsrv.me). It gets an SRV record, so players type just the name — no port. This is the cleanest option; hand out the bare name.IP:port exactly as shown on the Network page's Ports tab.⚠️ Heads up:
server-ipandserver-portinserver.propertiesare managed by the panel — never edit them. If the address is wrong, it's the address you gave out that's wrong, not those keys.
On the free plan, a Minecraft server stops automatically about 10 minutes after the last player leaves. So "it worked last night, now it times out" is usually just an idle-stopped server — start it from the panel and it comes back. A player joining again cancels the countdown. Premium servers run 24/7 and never idle-stop. See Free-plan gaming.
If the console shows the server fully started (Done (X.XXXs)) but nobody can connect, the address is the suspect, not the server.
"Failed to verify username" means the server asked Mojang to verify the player and it couldn't — the player is on a cracked (offline) client while your server is in online mode. This is an all-or-nothing setting for the whole server:
online-mode and walks you through the player-data migration (UUIDs change when you switch).You can't allow just one cracked player; it's the server's mode. Read Cracked vs online mode before you flip it — there are security trade-offs.
If nobody can join and the message is a plain timeout even with the right address and an online server, treat it like any other unreachable server: check the Firewall page for a Drop rule, and confirm the port on the Network page. I can't reach my app walks the same checks for the networking side.