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

If Microsoft Flight Simulator 2024 freezes at startup with the message “Server Issues Detected” and error code 001-400, the sim has failed to authenticate your account or connect to Microsoft’s servers. This happens on PC via Microsoft Store, Steam, and Game Pass. The sim loads past the intro screen and Xbox login, then stops cold with this error and refuses to continue.

This guide walks you through five fixes in order, starting with the quickest checks and ending with a full clean reinstall if needed.

What Causes MSFS2024 Error 001-400

The error appears when the sim cannot validate your game license or reach Microsoft Flight Simulator servers. Common causes include:

• Server outage or high traffic load on Microsoft’s end
• Authentication failure with your Xbox or Microsoft account
• Corrupted or outdated installation files
• Conflicting mods or add-ons in the Community folder
• Cloud sync mismatch between your profile and the game
• Using an unofficial or modified version of the game

How to Fix MSFS2024 Error 001-400

Work through these fixes in order. Most users resolve the issue by Step 3.

Fix 1: Confirm You Are Using an Official Copy

Unofficial or cracked versions fail license validation after updates and permanently trigger error 001-400. If your game came from one of these sources, it is legitimate:

• Microsoft Store
• Steam
• Xbox Game Pass

If you installed the game from any other source, that is the cause. You need to purchase and install an official copy to restore server access. Once that is done, proceed to Fix 2.

Fix 2: Launch in Safe Mode to Rule Out Mod Conflicts

Outdated aircraft packs, scenery mods, or UI add-ons in your Community folder cause a large number of 001-400 errors. Safe Mode loads the sim without Community folder content, which confirms whether a mod is blocking startup.

How to enter Safe Mode:

1. Launch MSFS 2024 and let it fail or crash as usual.
2. Close and restart the game immediately after.
3. When prompted, select Safe Mode.

If the sim loads in Safe Mode:

A mod in your Community folder is causing the error. To find it:

1. Open your Community folder (usually at C:\Users\YourName\AppData\Roaming\Microsoft Flight Simulator 2024\Packages\Community).
2. Move all mods out of the folder to a temporary location.
3. Add them back one at a time and relaunch MSFS after each addition.
4. When the error returns, the last mod you added is the broken file. Remove it permanently.

If Safe Mode also fails, continue to Fix 3.

Fix 3: Do a Clean Reinstall of MSFS2024

A standard uninstall leaves behind corrupted package files and configuration data. These leftover files cause error 001-400 to persist even after reinstalling. You need to delete them manually.

Step-by-step clean reinstall:

1. Go to Settings > Apps > Installed Apps, find Microsoft Flight Simulator 2024, and click Uninstall.
2. After uninstalling, manually delete any remaining game folders from these locations:
   • C:\Users\YourName\AppData\Local\Packages\Microsoft.Limitless_[random string]
   • For Steam installs: C:\Program Files (x86)\Steam\steamapps\common\Microsoft Flight Simulator 2024
3. Restart your PC.
4. Reinstall MSFS 2024 from the Microsoft Store or Steam.
5. Launch the game once without adding any mods back.

If the sim loads cleanly here, the issue is resolved. Restore mods one at a time as described in Fix 2.

Fix 4: Sign Out and Back Into the Xbox App

A corrupted Xbox account session on your PC can block authentication without any obvious error. Refreshing the session often clears error 001-400 without a full reinstall.

Steps:

1. Close MSFS 2024 completely.
2. Open the Xbox app on your PC.
3. Click your profile picture in the top left and select Sign out.
4. Sign back in with the same Microsoft account you use for MSFS.
5. Open the Microsoft Store, click your profile icon, and select Sign out, then sign back in.
6. Relaunch MSFS 2024.

This refreshes your authentication tokens across both Xbox and Store services, which often removes the 001-400 block.

Fix 5: Network and Xbox Services Checklist

If the error still appears, the problem is likely in your system services or firewall configuration. Work through each check below.

Enable Required Windows Services

Several Xbox services must be running for MSFS to authenticate properly.

1. Press Win + R, type services.msc, and press Enter.
2. Locate each of these services and confirm their Status is Running. If any show as Stopped, right-click and select Start:
   • Xbox Live Auth Manager
   • Xbox Live Networking Service
   • IP Helper
   • Gaming Services

Set System Time to Automatic

Incorrect system time causes license authentication to fail silently. Verify this setting:

1. Go to Settings > Time and Language > Date and Time.
2. Turn Set Time Automatically to On.
3. Restart your PC and relaunch MSFS.

Add MSFS Executables to Your Firewall Allowlist

Windows Firewall or third-party security software can block the sim’s connection to Microsoft servers. Add these files as allowed inbound and outbound apps:

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

To add them in Windows Firewall: go to Control Panel > Windows Defender Firewall > Allow an App Through Firewall > Change Settings > Allow Another App, then browse to each executable.

If you tried all five fixes and the error still appears, drop your setup details in the comments below and we will help you track down the cause.

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