Delta Force error 4/35: login failed (fix)
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Last checked
September 23, 2026
Login stops with "Login Failed, Please try again later. ID:4/35" — a Steam Discussions thread on this exact message drew 42 comments.
Also appears as: delta force error 4/35, delta force login failed 4/35, delta force login failed id 4/35, ID:4/35, delta force error id 4/35, login failed please try again later delta force
4/35 is one of Delta Force's login-gate errors, and the fix players report working most often is clearing a stale local session-cache file rather than anything server-side: the launcher keeps a login token in Launcher\Cache\TSF4G2\session.txt, and when that token goes stale (commonly right after a patch or a crash) the server rejects it and shows this ID instead of a clearer message. Deleting the file lets the game regenerate a clean one on next launch. If that doesn't clear it, a corrupted game file or an overzealous firewall/antivirus block is the next most likely cause.
Fix it, step by step
Delete session.txt in Launcher\Cache\TSF4G2, then log in again
Right-click Delta Force in your Steam Library, go to Properties > Installed Files > Browse to open the install folder. Navigate to Launcher\Cache\TSF4G2\ and delete session.txt, then relaunch and log in again — this is the highest-reported fix for this exact ID.
Verify integrity of game files in Steam
If the error persists, use Properties > Installed Files > "Verify integrity of game files" in Steam to repair anything the session deletion didn't fix.
Whitelist the install folder and executables in firewall and antivirus
If it still fails, whitelist Delta Force's install folder and launcher/game executables in your firewall and antivirus — several players report security software silently blocking the login connection.
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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.
From isthisgamedownMatched on ""
From isthisgamedownMatched on ""
From isthisgamedownMatched on ""
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