If Claude suddenly throws an error mid-use, gets stuck, or won’t produce results, it’s usually not that “the model is broken,” but rather that network issues, session state, or usage limits have triggered restrictions. This article provides a Claude troubleshooting checklist for the most common scenarios—working through 429 rate limiting, expired login sessions, and file upload failures one by one. Follow these steps and you can usually restore normal conversation within a few minutes.
Start with basic Claude troubleshooting: refresh, clear cache, and extension conflicts
If you run into a blank page, unclickable buttons, or an endless loading spinner, first refresh the page and reopen the browser tab—this is the quickest Claude troubleshooting step. Next, clear cache and cookies related to claude.ai, then log in again; many “fake freezes” disappear immediately. If you have ad blockers, script managers, or privacy/anti-tracking extensions installed, try disabling them temporarily and retesting—extensions blocking authentication requests are a very common cause.
429 rate limit / too many requests: reduce frequency and shorten input
When you see 429, “Rate limit,” or “too many requests,” the key to Claude troubleshooting is to “reduce load.” Split long questions into two or three messages, and avoid rapid consecutive retries. Also reduce large blocks of pasted text and avoid uploading multiple files at once. Waiting a short while before continuing usually restores access; repeatedly clicking resend every second will only prolong the rate-limited period.
Session expiration and repeated logins: cookies, time, and network environment
If you see “Session expired” or keep getting redirected back to the login page, follow the Claude troubleshooting approach by first checking whether your browser is blocking cookies—especially in private/incognito mode or with strict anti-tracking settings. Then confirm your system time is set to auto-sync; time drift can cause login token validation to fail. If you frequently switch network exits on a corporate network, public Wi‑Fi, or in a proxy environment, that can also trigger verification issues—try staying on a stable network and log in again.
File upload failures: format, size, and filename details
If uploads hang or fail, Claude troubleshooting suggests starting with the file itself: switch to more common formats (such as PDF, PNG/JPG, TXT) and compress the file to a smaller size. Keep filenames to English letters, numbers, and hyphens, avoiding special characters and overly long paths. If it fails repeatedly on the same network, try another browser or disable upload-related extensions, then upload files one by one for better reliability.
If errors persist: use a minimal reproduction to pinpoint the issue
The final Claude troubleshooting step is “minimal reproduction”: start a new conversation and send only a single short question—no files, no long instructions—and see whether replies are stable. If short messages work but long ones fail, the issue is usually input length, sending frequency, or the upload step; if short messages also fail, it’s likely the network, session, or server-side congestion. Gather the error message, steps to reproduce, and screenshots, then submit feedback via the Help Center—this is much easier to diagnose than simply saying “it doesn’t work.”
