When using Claude, if verification won’t go through, the page keeps retrying, or you’re told the account is unavailable, it’s often not that “the model is broken,” but rather your network environment, browser state, or a risk-control trigger. Below, organized by the most common symptoms, Claude troubleshooting is broken down into actionable steps so you can try to resolve it yourself first, then decide whether to contact support.
First determine whether it’s network blocking or an abnormal account status
The first step in Claude troubleshooting is to quickly cross-check by switching networks: switch from Wi‑Fi to a mobile hotspot, or try the reverse once, and see whether the issue disappears immediately. If it fails only on a specific network, suspect blocking by a proxy/VPN, corporate gateway, public DNS, or browser security extensions first. If it still fails consistently after switching networks, shift your focus to account risk controls or the browser session.
CAPTCHA / human verification failure: clear the session, disable extensions, use a stable IP
If Claude shows verification failures, a spinning CAPTCHA, or repeatedly bounces back to the login page, it’s usually related to cookies, privacy extensions, or an abnormal IP. First log out, clear site data (cookies and cache), then log in again in an incognito window; at the same time, temporarily disable ad blockers, script blockers, and fingerprint/anti-tracking extensions. If you’re using a proxy/VPN, switch to a more stable, lower-latency exit node and avoid frequently changing nodes; frequent IP changes make Claude more likely to trigger additional verification.
The page keeps “Retrying / Loading”: check the browser and system time
If Claude keeps loading or gets stuck after sending a message, common causes include an abnormal local browser state or unsynchronized system time. First do a forced refresh (hard reload), then confirm your system time and time zone are set to sync automatically; time drift can affect login token validation. If it still doesn’t work, try another browser or create a new browser profile to log in, to avoid old-profile cache policies, certificates, or enterprise management policies affecting Claude’s connection.
Account unavailable / suspected freeze: self-check first, then contact support
When Claude indicates your account is unavailable, you lack permission, or you may be restricted, first confirm whether you performed high-frequency logins in a short period, frequently switched networks, or repeatedly triggered verification—any of which can trigger risk controls. The most effective response is usually to stop repeated attempts, wait for a while before trying to log in again, and keep the same network and device environment as much as possible. If it still doesn’t recover, submit a ticket through the official support channel, including a screenshot of the error page, the time it occurred, your browser version, and a description of your network environment—this can significantly reduce back-and-forth during Claude troubleshooting.
“Minimum reproduction” checklist before submitting, to increase the chance of resolving it in one go
To help Claude troubleshooting converge faster, write the reproduction steps in three lines: which page you were on, what you clicked, and what message appeared. Then add two key details: whether you used a proxy/VPN, and whether you enabled any privacy/blocking extensions. Providing all of this at once to support or internal colleagues investigating the issue is often much more effective than simply saying “Claude doesn’t work.”
