How to Fix Cloudflare Error 1010 (Browser Signature Blocked)

By ErrorFix · Updated October 23, 2026 · 5 min read

What Error 1010 means

Cloudflare's 1xxx error family covers DNS, proxy, and security-configuration problems, and Error 1010 sits in the security corner. The page reads "Access Denied" and says the owner of this website has banned your access based on your browser's signature, with a Ray ID printed at the bottom. That wording is the whole story: the website owner's Browser Integrity Check examined the HTTP headers your browser sent — the User-Agent, the Accept headers, and the other fingerprints a request carries — and decided your client does not look like a real, trustworthy browser. Cloudflare is simply enforcing the owner's rule.

It helps to keep 1010 straight from its neighbors, because they look similar but need different fixes. Error 1009 bans your country or region, Error 1015 rate-limits you for sending too many requests, Error 1020 matches a custom WAF rule the owner wrote, and Errors 1005 or 1006 through 1008 ban your network or IP address. Only 1010 is a judgment about your browser's identity. If your page says your browser's signature is banned, these are the right steps; if it says anything else, look up that exact code instead.

Common causes

• Browser Integrity Check is enabled by the site owner: the most common trigger. This Cloudflare setting inspects every request's headers and challenges anything missing a standard User-Agent, anything with a known bot or scraper signature, and anything that looks assembled by a script. The owner's setting is strict by design, so it also catches legitimate visitors whose browsers send unusual headers.
• Extensions that rewrite your User-Agent: privacy, anti-fingerprinting, and User-Agent-switcher extensions strip, blank, or randomize the headers Cloudflare inspects. To Browser Integrity Check, a randomized signature looks exactly like a bot trying to hide — which is precisely what the check was built to stop.
• In-app and outdated browsers: browsers embedded inside social media or shopping apps, plus browser versions that are years out of date, send unusual or incomplete headers and run on older TLS stacks. The check judges the signature, not the brand name, so an obscure client gets flagged even if you personally did nothing unusual.
• Scripts and API clients with default identifiers: code that fetches a site through a protected domain — a Python script using urllib's default User-Agent, a curl call with no headers, an automated integration — arrives with a signature that screams non-browser. Developers commonly meet Error 1010 this way the first time they point a script at a Cloudflare-protected API.
• Hardened or stripped-down browser configurations: corporate lockdowns, debloated Windows builds, and privacy-focused forks that neuter headers for tracking protection can remove the very headers the check requires. If your browser was customized for maximum privacy, its signature may no longer pass.

How to fix Error 1010 — step by step

Steps 1 through 5 are for visitors and developers. Step 6 is for site owners.

1. Confirm the page is a browser-signature ban, not a different block. Cloudflare's Error 1010 page reads Access Denied and states that the owner of this website has banned your access based on your browser's signature, with a Ray ID printed at the bottom. This wording matters because neighboring codes look similar: 1009 bans your country or region, 1015 rate-limits you for sending too many requests, 1020 matches a custom WAF rule the owner wrote, and 1005 or 1006 through 1008 ban your network or IP address. If your page says your browser's signature is banned, you are dealing with Browser Integrity Check and the steps below apply. If it says something else, look up that exact code instead.
2. Visitor: open the site in a current mainstream browser. Browser Integrity Check passes ordinary traffic from up-to-date versions of Chrome, Edge, Firefox, and Safari, so the fastest test is to load the site in one of those with default settings and no modifications. Open a fresh profile or an incognito/private window with all extensions disabled, then reload the page. If the site loads in the clean profile but not in your normal browser, something about your usual setup — an extension, a spoofed User-Agent, or a hardened configuration — is producing a signature Cloudflare rejects.
3. Visitor: disable extensions that rewrite your User-Agent or headers. Privacy and anti-fingerprinting extensions sometimes strip, blank, or randomize the User-Agent and other headers, which is exactly the behavior Browser Integrity Check is designed to catch. Turn those extensions off for the affected site (or globally, just for the test), quit and relaunch the browser so no cached session lingers, and try the site again. If the error disappears, you have found your culprit: either leave the extension off on that site or whitelist the site in the extension's settings.
4. Visitor: avoid in-app and outdated browsers. Browsers embedded inside other apps, plus very old browser versions, often send unusual or incomplete headers and run on outdated TLS stacks that fail integrity checks. Tap links so they open in your device's real browser rather than an in-app viewer, and update your browser to the latest version through its normal update path. On iOS, any third-party browser still uses the same engine, so updating iOS itself updates the engine behind them.
5. Visitor or developer: contact the site owner with your Ray ID and IP. Only the site owner can relax a 1010 block — Cloudflare support cannot override a customer's own security settings. Copy the Ray ID and the IP address shown at the bottom of the error page, then reach the owner through their contact email, social accounts, or support form. Tell them you are seeing Cloudflare Error 1010 (browser signature banned), include your IP and Ray ID, and ask them to review their Browser Integrity Check or allow your client. The Ray ID lets them find the exact blocked request in their Security Events log, which makes their job much faster.
6. Site owner: tune Browser Integrity Check instead of leaving it on full blast. Log in to the Cloudflare dashboard, select the domain, and go to Security, then Events to find the blocked requests by their Ray IDs — this confirms the Browser Integrity Check rule is what fired and shows the client signatures being rejected. If legitimate visitors or known integrations keep getting flagged, go to Security, then Settings and turn Browser Integrity Check off, or keep it on and add targeted IP Access Rules to allow the affected clients. Where you want a softer filter, change the offending rule's action to Managed Challenge so real people can still pass a verification instead of being blocked outright.

Did this fix it? Quick checklist

• The error page says your browser's signature is banned — you confirmed it is Error 1010, not 1009, 1015, or 1020
• You opened the site in a current mainstream browser with default settings, in a clean profile or incognito window with extensions off
• You disabled User-Agent spoofing or header-rewriting extensions and relaunched the browser before retesting
• You sent the site owner your Ray ID and IP address, and they adjusted Browser Integrity Check or added an allow rule — the block lifts on the next request after that

If you are a developer and your script still gets 1010 after you set a normal-looking User-Agent, the owner may have paired Browser Integrity Check with a stricter custom WAF rule — the page wording will still read 1010, but the Events log on the owner's side will show which rule actually fired. Ask the owner to look up your Ray ID under Security, then Events, and to allow your integration explicitly. And if you are a visitor whose site works on a phone but not a desktop, compare the two browsers' extension lists: the desktop is almost always the one running a header-rewriting extension you forgot about.