A Practical Guide to Troubleshooting ChatGPT Errors: Fixing 429 Rate Limits, 403 Denials, and Session Expiration

When ChatGPT won’t open, shows “Something went wrong,” or won’t send messages, don’t rush to reinstall. The troubleshooting guide below follows a “locate first, then fix” approach, clearly covering the most common issues—rate limiting, access denial, session invalidation, and more—in one go. Follow these steps and you can usually get back to normal within minutes.

First, determine whether it’s a network problem or an account status issue

When troubleshooting ChatGPT errors, the first step is to verify by switching to a different network environment: on the same device, switch to a mobile hotspot or another broadband connection and see whether it recovers immediately. If it works after switching networks, the issue is likely a connection problem caused by local DNS, a proxy, or blocking policies on a company/school network.

If it doesn’t work on any network, then check your account: try logging out and back in, or sign in once using an incognito/private window. Session expiration or an invalid login token can also appear as repeated redirects or endless loading.

Common errors: how to handle 429 rate limiting and 403 access denied

If you see 429 (Too Many Requests), it’s usually because too many requests were made in a short time, or multiple people on the same network are sharing access and triggering rate limits. Troubleshooting suggests first disabling auto-refresh plugins/scripts, waiting a bit and trying again, and reducing the number of chat tabs open at the same time.

If you encounter 403 or “Access denied,” first check whether you’ve enabled a proxy, accelerator, or security software HTTPS scanning that rewrites traffic. Temporarily turn those tools off and retry; if your company network uses a unified gateway policy, switching to a personal network is often the most straightforward fix.

Blank page or endless spinning on the web: cache and extension conflicts are the most common

One of the most effective troubleshooting steps is an “incognito window comparison”: if it opens normally in incognito, it’s likely caused by an extension or cached data. Handle it in order: first disable ad blockers, script managers, and privacy-protection extensions; then clear site cache and cookies; finally restart the browser.

If you use multiple browsers, you can also test with the system’s built-in browser once to quickly rule out a corrupted configuration in a particular browser.

Image/file upload failures: check size and format first, then network stability

When uploads fail, troubleshooting recommends a “minimal verification” first: try a smaller file and a common format (such as PNG/JPG/PDF) to rule out issues with the file itself. Then confirm whether the network is stable—especially on mobile networks that frequently switch base stations, which can easily interrupt uploads.

If it keeps getting stuck on “Uploading,” refresh the page and upload again, and avoid starting multiple large uploads at the same time.

Still not resolved: how to collect information and submit feedback more efficiently

If none of the above troubleshooting steps work, it’s recommended to record three things: the exact error message, the time it occurred, and your network/browser environment at the time. Then submit it via the in-page Help & Feedback entry point, or include a screenshot of the console errors (if you know how to check them), which can significantly improve diagnostic efficiency.

While waiting for it to be handled, temporary workarounds are usually switching networks, using an incognito window, or signing in on another device to avoid getting blocked from work.