How to handle Claude errors: conversation interruptions, 429 rate limiting, attachment upload timeouts

When writing with Claude, a sudden interruption halfway through, a 429 rate-limit warning, or an attachment that keeps spinning are the most common Claude error scenarios. Below, following the order of “check the environment first, then check usage, and finally check the file,” we’ll explain in one go how to diagnose and resolve Claude errors.

Check your browser and network first: many Claude errors are actually local issues

When you encounter a Claude error, do two quick things first: force-refresh the page (Windows: Ctrl+F5, Mac: Cmd+Shift+R), then switch to another network (for example, from Wi‑Fi to a mobile hotspot). Many Claude errors like “send failed” or “can’t load conversation” are caused by cache, DNS, or temporary network instability.

If you have ad blockers, script managers, or privacy extensions installed, it’s also recommended to disable them temporarily and try again. When Claude’s page requests are blocked by extensions, it looks like a Claude error on the surface, but in reality the browser is blocking critical resources.

Messages won’t send / conversation interrupted: split input into smaller parts and lighten the context

When a Claude error shows up as “message won’t send” or “conversation interrupted,” first check the content length and the context. Split a large chunk of content into two or three messages, or ask Claude to “only read, not analyze” first—confirm it can receive the content normally, then continue.

Another common cause is that the conversation context is too long, increasing processing load. You can start a new conversation and restate the necessary background in bullet points; this is often easier to avoid Claude errors than forcing continuation in an old thread.

429 rate limiting and Overloaded: it’s not your mistake—it’s usage limits or congestion

If you see 429 (rate limiting) or a Claude error like “too many requests,” it usually means requests are too frequent in a short period, or the service is busy. The most reliable approach is to pause for a few minutes and try again, and avoid rapidly clicking send repeatedly or retrying the same message over and over.

If it says Overloaded, don’t keep refreshing and brute-forcing it. Try using it at a different time, reduce parallel requests (for example, don’t keep multiple tabs open making Claude run tasks at the same time), and the success rate will noticeably improve. These Claude errors are essentially congestion control.

Attachment upload failed / timed out: verify format and size first, then “re-upload”

For attachment-related Claude errors, the most common causes are unsupported formats, files that are too large, or a dropped connection during upload. First confirm the file type is a common format (such as PDF, images, etc.), then reduce the file size (for example, convert images to JPG, compress PDFs), and then re-upload instead of repeatedly clicking continue.

If the same file triggers Claude errors multiple times, try switching browsers or logging in with an incognito window and uploading again to rule out local cache and abnormal session state. If it still doesn’t work, split the file into multiple smaller files and upload them; this is usually more stable than “forcing one large file to upload.”

If Claude errors keep recurring: use the shortest path to confirm whether it’s an account or region issue

If Claude errors persist and are unrelated to the network, first log out and log back in, and confirm whether you can send the simplest test message in a new conversation (for example, a single sentence). If even simple messages fail, it’s more likely a session state issue, risk control, or a service-side problem.

As a final step, record the exact error message text and the approximate time, rather than only saying “it doesn’t work.” Even though they’re all Claude errors, “429,” “Overloaded,” and “Network error” require completely different handling directions—grabbing the key wording helps you avoid detours.