The most common problems when using Claude are: you can’t log in, messages won’t send, or file uploads fail. Below is a step-by-step troubleshooting flow in this order: rule out external factors first, then adjust settings, and finally contact support. If you follow it, you can usually identify where the issue is coming from.
First, confirm whether it’s Claude’s server side or a network-related issue
If Claude suddenly gets stuck loading, shows a blank page, or becomes unresponsive, try switching networks once: move from Wi‑Fi to a mobile hotspot, or the other way around. Corporate or campus networks often have policy restrictions that can block Claude requests, making it look like the site is “frozen.” If you’re using a proxy/VPN/accelerator, also try turning it off temporarily before opening Claude again, since unstable routing can cause repeated disconnects.
Claude login failure: verification, expired sessions, and browser issues
If Claude shows a login error or keeps redirecting you back to the login page, a common cause is an old session stored in your browser cache. Log out first, then clear Cookies and cache for the site, refresh, and log in to Claude again. If you have ad blockers, script managers, or privacy extensions installed, pause them temporarily—these can interfere with Claude’s login redirects or verification requests.
Messages won’t send / send failed: overly long inputs and rate limits
If Claude shows “send failed” or “request error,” split the same content into shorter chunks and send them separately—especially if you pasted long text, code, or tables. Rapid back-to-back sends can also trigger rate limiting; waiting one or two minutes and trying again often resolves it. If a chat is stuck on “generating,” copy your input, refresh the page, return to Claude, and resend to avoid waiting indefinitely.
Claude file upload failure: format, size, and local permissions
If Claude keeps spinning during upload or reports an upload failure, first check whether the file is too large, uses an uncommon format, or has special characters in the filename that cause recognition issues. Convert the file to a common format and rename it with simple English letters/numbers, then re-upload in Claude—success rates typically improve. If your browser doesn’t have file access permissions (especially on mobile or managed devices), switching to a desktop browser to log in to Claude and upload is usually more reliable.
If errors persist: the most effective self-check and support report
If Claude still isn’t usable, try reproducing the issue in an incognito/private window. Incognito mode bypasses most cache and extension interference, helping you confirm whether the problem is local to your device/browser. Record the error message, the steps that trigger it, your network environment (e.g., corporate vs. home), and whether you’re using a proxy, then submit feedback via Claude’s help entry. The more specific the details, the faster Claude support can identify the cause and provide a targeted fix.
