How to Fix MSFS2024 Error 001-400: Server Issues Detected Problem Solved

If Microsoft Flight Simulator 2024 loads past the intro screen and Xbox/Microsoft login but stops with the message “Server Issues Detected” followed by error code 001-400, you’re not alone. Many players report that the sim crashes or freezes at this stage, unable to authenticate or load online content.

How to Fix MSFS2024 Error 001-400: Server Issues Detected Problem Solved
How to Fix MSFS2024 Error 001-400: Server Issues Detected Problem Solved

What Causes MSFS2024 Error 001-400

The error typically appears when the game cannot connect to Microsoft Flight Simulator servers or validate your game license. The most common reasons include:

  • Server outage or high traffic load
  • Authentication failure with Xbox/Microsoft account
  • Outdated or corrupted installation
  • Conflicting mods/add-ons in the Community folder
  • Cloud sync mismatch between device and game
  • Non-official (cracked or modified) version

If you are using a legitimate version of the game and the simulator stops loading, follow the fixes below in order.

How to Fix MSFS2024 Not Loading (001-400 Error)

You only need to complete these steps once for most systems.

1. Make Sure You Are Using an Official Copy

Unofficial or cracked versions often fail license validation after updates, permanently causing 001-400.
If your game is installed via:

  • Microsoft Store
  • Steam
  • Game Pass

Then proceed to the next step.

If not — install an official release to restore server access.

2. Launch in Safe Mode (Fix for Mod/Add-on Conflicts)

A high number of CTDs occur because of outdated aircraft, scenery packs, or UI mods.

How to Start Safe Mode:

  1. Launch MSFS → wait for it to fail or crash.
  2. Restart the game.
  3. Select Safe Mode when prompted.
  4. If the sim loads normally → a mod is the cause.

Now Fix It:

  • Open your Community folder.
  • Remove suspicious or newly added mods.
  • Re-add them one by one to identify the broken file.

If Safe Mode still fails, continue below.

3. Completely Reinstall MSFS2024 (Clean Method — Most Reliable Fix)

A normal uninstall leaves behind corrupted core files. You must remove them manually.

Step-by-Step Clean Reinstall:

  • Go to:
Settings → Apps → Installed Apps → Microsoft Flight Simulator → Uninstall
  • Delete leftover folders:
C:\Users\<YourName>\AppData\Local\Packages
C:\Program Files (x86)\Steam\steamapps\common
  • Restart your PC.
  • Reinstall MSFS from Microsoft Store or Steam.
  • Launch once before restoring mods.

If the game loads here, your issue is solved.

4. Fix Cloud Sync Problems (Surprisingly Effective)

For some users, the issue was caused by a broken cloud configuration.

Quick Cloud Repair Trick:

  1. Install MSFS2024 on another PC/laptop (even temporarily).
  2. Sign in and launch it once.
  3. Return to your main PC and open MSFS again.

This forces cloud-profile repair and often removes 001-400 instantly.

5. Network & Xbox Services Checklist

If you still cannot load into the sim, verify these:

Enable Required Services

Press Win + R → services.msc, ensure the following are Running:

  • Xbox Live Auth Manager
  • Xbox Live Networking Service
  • IP Helper
  • Gaming Services

Check Time/Region

Incorrect system time = license fails to authenticate.

Settings → Time & Language → Set Time Automatically → ON

Firewall Allowlist

Add these as allowed apps:

  • FlightSimulator.exe
  • GamingServices.exe
  • XboxAppServices.exe

MSFS2024 error 001-400 usually appears when the game fails to authenticate with Xbox or Microsoft servers, or when mods and corrupted files interfere with loading. By running Safe Mode, clearing or updating add-ons, reinstalling the simulator properly, or repairing cloud sync, most players can get the game working again within minutes. Follow the steps in order, and your simulator should load smoothly without the server issue blocking startup.

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