Epic Games / Fortnite Error Codes: Login, Matchmaking, Updates, and Connectivity

Use this guide to separate account auth problems, launcher update state, and network quality issues before reinstalling or changing router settings.

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TL;DR

✓ Check service status first if login/matchmaking fails widely.
✓ Login failures can be account/session or network/TLS related.
✓ Update failures often trace to disk space, cache state, or interrupted downloads.
✓ Matchmaking failures can be region/server load or packet loss/NAT problems.

Quick Navigation

Symptoms Root Causes Step-by-step fixes What NOT to do If it persists Code directory Related guides & hubs FAQ References

Symptoms / When you see this

✓ Launcher login fails, update loops, downloads stall.
✓ Matchmaking fails or drops from queues.
✓ Connectivity errors spike after patches.

Root causes (grouped)

✓ Service-side outage or maintenance.
✓ Account auth/session state issues.
✓ Network filtering/DNS/TLS issues.
✓ Update cache state and disk constraints.

Step-by-step fixes (safe, prioritized)

✓ Check service status and retry later if degraded.
✓ Restart launcher/PC and router.
✓ Verify time/date and test DNS.
✓ Confirm disk space and retry update after a clean restart.
✓ Test another network to isolate router/ISP restrictions.

What NOT to do

✓ Do not spam login attempts; you can trigger security throttling.
✓ Do not disable security permanently; test and revert.
✓ Do not reinstall first if services are down.

If it persists (escalation checklist)

✓ Capture exact code/text, timestamp, and region.
✓ Confirm whether it follows the account across networks/devices.
✓ Use official support for account enforcement or purchase issues.

Code directory within this guide

✓ Not every failure exposes a stable public code. When there is no code, focus on symptom bucket + status page.

Code	Meaning	Next step
AS-3	Network connectivity issue — This code indicates that the launcher could not establish a required network connection.	Follow the checklist on the code page
IS-DS01	Disk space error — This code indicates that insufficient disk space prevented an operation from completing.	Follow the checklist on the code page
LS-0009	Patch failed — This code indicates that a patch or update could not be applied successfully.	Confirm storage/prerequisites; retry after restart
LS-0013	Launch failed — This code indicates that a game could not be launched through the Epic Games Launcher.	Follow the checklist on the code page

Tip: If your exact code isn’t listed, use the closest hub link above and browse related prefixes or message patterns.

FAQ

Why does matchmaking fail when login works?

Matchmaking relies on different services and can fail due to region/server load even when auth is fine.

Do update errors always mean corruption?

No. They can be service-side, cache, or disk-space related. Validate those first.

Fastest isolation test?

Try another network (hotspot). If it works there, your home network path is likely involved.

Can DNS affect launcher services?

Yes. Unreliable DNS can break endpoint resolution even when browsing seems normal.

Should I reinstall first?

Usually no. Check status, disk space, and update state first.

What if the issue follows the account?

That suggests account state/enforcement; use official support channels.

Why do errors spike after patches?

Patch releases create high demand and temporary service instability.

What should I avoid?

Avoid repeated retries and risky router changes without a rollback plan.

References / Notes

✓ Platform status page
✓ Launcher logs
✓ Official support for account issues