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The error is not one single fault. Community reports associate it with server outages, interrupted connections, stale Steam or DayZ session data, damaged files, firewall blocks and mismatched server builds. Record the exact code before changing anything, because 0x000400e1, 0x00040031 and WaitAuthPlayerLoginState can require different checks.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhat the DayZ authentication error means
DayZ authenticates your client with the server before it puts your character into the world. A failure at that stage can occur on the server, across your connection, or in the local Steam/DayZ state. The same broad “authentication error” wording therefore does not identify one universal cause.
Reports commonly mention error 0x000400e1, 0x00040031 and the state name WaitAuthPlayerLoginState. Players also see “already in the target session,” login timeouts, database-related errors and, in some cases, a warning that the client is newer than the server. None of these messages has a single, officially documented fix in the material available for this guide. The remedies below are community-reported troubleshooting steps, not a Bohemia Interactive guarantee.
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There is no published rate for this error, so a forum anecdote should not be treated as a success percentage. Start with checks that cost little and do not alter your files, then move toward local-data repairs only if the problem persists.
Before changing anything, capture the details
Write down the complete message and code, rather than only “authentication error.” Also note the platform, the server or community server you selected, and whether the failure happens on every server or only one. If the message appears after a crash, disconnect or character transfer, record that as well.
- Exact code or state: for example,
0x000400e1,0x00040031orWaitAuthPlayerLoginState. - Platform and launcher: PC through Steam, Xbox or PlayStation.
- Scope: one server, several community servers, or official servers.
- Timing: immediately after selecting a server, after the loading screen, or after a disconnect.
- Build information: the game version shown by the launcher and any “client newer than server” text.
These details prevent you from repeatedly applying a local fix to what may be a server outage, and they give the feedback tracker or official forums enough information to investigate if the sequence fails.
Use this fix order on PC
Follow the steps in order. Test a server after each major change so you know which action altered the result. If the error disappears, stop; unnecessary resets can remove useful local settings.
1. Check the server’s status first
A server that is offline, restarting or not accepting authentication cannot complete your login. A Nitrado troubleshooting guide identifies unavailable servers as a primary cause associated with 0x000400e1. Check the server host’s status notice, its community channel or the in-game server list, and try a different server. If every server fails, continue with the network and client checks; if only one fails, the server operator may need to act.
2. Restart the router and confirm the connection
Power-cycle the router according to its normal procedure, wait until it has fully reconnected, and then launch DayZ again. Nitrado’s guidance attributes unexpected authentication errors to throttled or offline connections. A third-party 2026 troubleshooting guide also recommends trying a wired connection because unstable Wi‑Fi and high latency can cause authentication timeouts. If Ethernet is not practical, move closer to the access point, pause large downloads and test another network when possible. Do not interpret a successful login on one network as proof that the game files are damaged.
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3. Close and restart DayZ, the launcher and Steam
Exit the game normally. Close the DayZ launcher, then exit Steam from its menu rather than leaving it running in the notification area. Start Steam again and launch DayZ. This clears stale authentication and session state without deleting configuration files. One Steam player described a similar sequence—turning off the game, closing the launcher and resetting Steam—as a workaround.
4. Sign out of Steam and reboot the PC
If a normal restart did not help, use Steam’s account menu to sign out, restart Windows, sign back in and launch DayZ. A player report on Bohemia Interactive’s feedback tracker describes this as the fix for an authentication failure; it remains a user report, not an official resolution. Rebooting also releases a stuck game process that may not be visible after a crash.
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5. Verify DayZ’s installed files
On Steam, open Library, right-click DayZ, choose Properties, open Installed Files, and select Verify integrity of game files. Let Steam complete the check and download any replacement data before starting the game. This is a low-cost local repair: it does not change your server account, and it can correct an incomplete or altered installation. Test the same server after Steam reports completion.
6. Reset local DayZ data only after protecting cloud settings
If verification did not resolve the error, a 2026 third-party guide recommends resetting the local client state:
- In Steam, open DayZ’s properties and temporarily disable Steam Cloud for the game.
- Exit DayZ and Steam completely.
- Delete the local
DocumentsDayZfolder in your Windows user profile. - Start Steam and run the file-integrity check again.
- Launch DayZ and recreate any local preferences the reset removed.
- Re-enable Steam Cloud only after confirming that the game can authenticate.
Disabling Steam Cloud before deleting the folder matters: otherwise, Steam may restore the same problematic local files. This step is more intrusive than verification because it removes local configuration and cached data. It is not a character-wipe instruction; it targets the client folder, but you should preserve any files you deliberately need before deleting it.
7. Allow DayZ and BattlEye through security software
Check the Windows firewall and antivirus quarantine or application-control lists. Allow the DayZ executable, the Steam client and BattlEye when your security software asks for network or game access. A firewall rule that blocks the anti-cheat component can look like a server authentication failure. Avoid disabling protection permanently; create an allow rule, test the game, and restore normal protection settings if the rule makes no difference.
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8. Run Steam as administrator when your account permits it
Nitrado’s troubleshooting material suggests starting Steam with administrator rights. Right-click the Steam shortcut, choose Run as administrator, and then launch DayZ. Use this as a diagnostic step rather than a permanent requirement. If it works only with elevated rights, check Windows permissions and security software instead of assuming that every future launch needs administrator access.
9. Close optional background programs
Players have reported fewer authentication failures after closing overlays and background utilities, including Discord or graphics-card software. The evidence is anecdotal and conflicting: one 2026 guide labels Discord a trigger, while a 2025 Steam commenter described that explanation as an old story. Treat this as a low-confidence isolation test. Exit overlays and recording tools, try one login, and reopen them one at a time if the error is gone. Do not present this step as a confirmed cause.
10. Wait before reconnecting when a session is still registered
For “already in the target session,” stop launching repeated attempts. Wait several minutes, then try to join again. The 2026 guide calls waiting and rejoining the most reliable response for that exact message. A Steam commenter said that dying on the server, logging out and logging back in cleared it, but that is an anecdotal and potentially character-impacting workaround; waiting is safer. If the message persists across a reasonable wait and a full Steam restart, record the server, time and code for the operator or feedback report.
Match the remedy to the message
| Message or code | What to check first | Evidence and limits |
|---|---|---|
0x000400e1 |
Server availability, then router and connection | Nitrado’s guide links this code primarily with servers being down or an offline/throttled connection. It is hosting-provider guidance, not an official Bohemia fix. |
0x00040031 |
Steam/session restart, then verify files | A Bohemia-run feedback-tracker entry and a third-party guide associate this code with WaitAuthPlayerLoginState. Reports do not establish one definitive cause. |
WaitAuthPlayerLoginState |
Complete Steam restart; then sign out and reboot | Community reports describe stale session state. Discord involvement is disputed, so test it only as an optional isolation step. |
| “Already in the target session” | Wait several minutes and rejoin once | Waiting is the least disruptive reported remedy. The suggested “die, log out and log in” workaround is anecdotal. |
| Database or login timeout | Retry after checking server status and your connection | A December 2024 discussion describes success after two or three retries. That may indicate a transient server-side condition; it is not a guaranteed fix. |
| “Client is a newer build than the server” | Confirm both sides have updated | One discussion reports that the warning disappeared after the server updated. The report is not independently verified, so contact the server operator if versions remain different. |
How to tell whether the problem is yours or the server’s
Use scope and timing rather than guessing. If one community server rejects you while other servers accept you, the affected server, its restart cycle or its version is the stronger suspect. If every server rejects you on one PC and network, prioritize the Steam, firewall and local-data steps. If several players report the same failure simultaneously, a server or service-side incident becomes more plausible.
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Repeatedly retrying can make a session-related message harder to interpret. After one or two controlled attempts, pause and check for a server notice. A transient database or authentication timeout may clear without any local change; the December 2024 player discussion reporting success after two or three tries is evidence of that possibility, not a service-level promise.
Xbox and PlayStation troubleshooting
The PC procedure cannot be copied directly to consoles. Steam’s file-integrity tool and the Windows DocumentsDayZ folder are unavailable on Xbox and PlayStation. The available community guidance for consoles is limited, and no captured source independently documents a console-specific repair sequence.
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For a console, use the non-destructive checks first: wait if the message says you are already in a session, restart the game and console, restart the router, and test another server. Reinstalling is a last resort because it takes longer and does not correct a server outage. Record the exact code and console model before contacting support. Do not assume that a PC file-verification remedy has an equivalent console menu.
Cost, effort and scope of each fix
| Action | Cost and effort | What it changes | Best use |
|---|---|---|---|
| Check server status or try another server | Free; a few minutes | Nothing on your device | First check for 0x000400e1 or a one-server failure |
| Restart router or change connection | Free; a few minutes | Network session | Offline, throttled, unstable or high-latency connections |
| Restart DayZ, launcher and Steam | Free; a few minutes | Processes and session state | Stale authentication and WaitAuthPlayerLoginState |
| Sign out and reboot PC | Free; several minutes | Steam login and operating-system processes | Failures that survive a normal game restart |
| Verify Steam files | Free; download time may vary | Damaged or incomplete installation files | Persistent PC errors after network checks |
Reset DocumentsDayZ |
Free; more disruptive | Local settings and cached client data | Verification succeeds but authentication still fails |
| Firewall or antivirus allow rule | Free; moderate care required | Network permissions | Security software may be blocking DayZ or BattlEye |
| Reinstall on console | Free financially; highest download and setup time | Entire local installation | Last resort after server, network and restart checks |
When nothing works: report a reproducible case
Bohemia Interactive does not have a surfaced official support article that definitively maps these authentication codes to fixes. If the ordered checks fail, report the problem through the DayZ feedback tracker or official forums. Include the exact code, full message, platform, game build, server name, approximate time, whether other servers worked, and the steps you already tried. A screenshot or log excerpt can distinguish 0x00040031 from 0x000400e1 and from a version mismatch.
Keep the report factual. State whether the issue reproduces after a router restart, a complete Steam sign-out, file verification and a clean test with background overlays closed. If only one server is affected, contact that server’s operator as well; a local reinstall cannot repair a server that is offline or running an incompatible build.
The Bottom Line
Check the server first, then reset the connection and Steam session, verify DayZ’s files, and only afterward reset local data. Wait rather than repeatedly reconnecting when DayZ says you are already in the target session. Because these remedies are community-reported rather than an official Bohemia Interactive fix, preserve the exact code and platform details for a useful escalation.
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