Fortnite Error Code IS-PT01: How to Fix It

Easy 5–20 minutes Medium Severity Verified June 2026
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Error Code
IS-PT01
Brand
Fortnite
Product Type
game
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
5–20 minutes
Fortnite error code IS-PT01 means your game has received an invalid or expired party token, which is the session credential Epic Games uses to keep you connected to a party or group lobby. This typically happens when there's a disconnect between your client and Epic's party servers — often triggered by network hiccups, server outages, or a stale game session. The good news is that IS-PT01 is almost always fixable without any technical expertise and rarely points to a hardware problem.
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Tools You'll Need

How to Fix Error Code IS-PT01

  1. Check Epic Games Server Status

  2. Restart Fortnite Completely

  3. Sign Out and Sign Back Into Your Epic Account

  4. Disband Your Current Party and Rejoin

  5. Restart Your Router and Modem

  6. Flush DNS Cache (PC Only)

  7. Change Your DNS Server to a Public DNS

  8. Verify Game Files or Reinstall Fortnite (PC)

    Reinstalling will not delete your account progress or purchases, as all data is stored on Epic's servers. However, you will need to re-download the full game.
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When to Call a Professional

If you have tried every step above and the error persists across multiple days and multiple accounts on the same network, contact Epic Games Player Support directly at epicgames.com/help. Provide your display name, platform, and a description of the error. If the error only appears on your network but not on mobile data or a friend's network, your ISP may be blocking or throttling the specific ports Fortnite uses — in that case, contact your internet provider. There is no hardware repair needed for this error.

Frequently Asked Questions

What does Fortnite error code IS-PT01 mean?
IS-PT01 stands for an invalid party token error. Fortnite uses temporary session tokens to keep players connected in a party lobby. When that token expires, becomes corrupted, or cannot be validated by Epic's servers, you see IS-PT01. It is usually caused by a brief network drop, an Epic server hiccup, or a stale game session.
Is IS-PT01 an Epic Games server problem or my problem?
It can be either. Start by checking status.epicgames.com. If Epic's Party Services show any issues, the error is on their end and will resolve on its own. If servers appear healthy, the problem is likely a local network issue or a stale session on your device, both of which the steps above will fix.
Why do I keep getting IS-PT01 every time I try to join a party?
Repeated IS-PT01 errors when joining parties usually point to a DNS or connectivity issue between your device and Epic's party service. Try changing your DNS to Google's public DNS (8.8.8.8 / 8.8.4.4) and restarting your router. On PC, flushing your DNS cache with the ipconfig /flushdns command also helps.
Does IS-PT01 mean my Fortnite account is banned or suspended?
No. IS-PT01 is purely a network session error and has nothing to do with account bans or suspensions. If your account were banned, you would see a different error message explaining the account action. IS-PT01 only means the party token is invalid, not that your account has any issues.
How do I fix IS-PT01 on PS5 or Xbox?
On PS5 or Xbox, close the Fortnite application completely, then restart your console. Go to your console's Network Settings and try switching to a wired Ethernet connection if you are on Wi-Fi, or manually set your DNS to 8.8.8.8 and 8.8.4.4. Re-launch Fortnite and form a new party rather than rejoining the old one. If the issue continues, check Epic's server status page from your phone or another device.

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