Is This Game Down
Browse games
You can fix thisReported

Delta Force error 5/1200: login failed (fix)

Delta Force server status →

Written by

IsThisGameDown

Last checked

September 23, 2026

Delta Force Steam Discussions — "To fix 'Delta Force login failed 5/1200'" ↗

Login fails with an "ID: 5/1200" message instead of reaching the main menu; several independent Steam Discussions threads report the exact same code.

Also appears as: delta force error 5/1200, delta force login failed 5/1200, delta force login failed id 5/1200, ID: 5/1200, delta force error id 5 1200

5/1200 behaves like the same family of login errors as 4/35 — a Steam Discussions post specifically titled "To fix 'Delta Force login failed 5/1200'" describes deleting the same cached session token file the launcher stores locally, and reports that fixing it. It isn't described as a server-side outage in any of the threads reporting it; treat it as a local login-cache issue first.

Fix it, step by step

  1. Delete session.txt in Launcher\Cache\TSF4G2, then restart

    Right-click Delta Force in Steam Library > Properties > Installed Files > Browse. Go to Launcher\Cache\TSF4G2\ and delete session.txt, then restart the game — this is the fix reported to work for this exact ID.

  2. Verify integrity of game files in Steam

    If that doesn't resolve it, run "Verify integrity of game files" from Steam's Installed Files tab to repair anything else out of place.

Hit this error? Leave a comment

Say where you are, what you see on screen, and whether any fix worked for you.

No links. Anonymous, no account. Keep it about the game.

What people are saying

Notes from players who've hit this one — no time limit, an answer from months ago is still an answer.

  • Nothing reported here yet.
← 4-354-28 →

Other Delta Force error codes

Recently added