Getting PerimeterX? Here’s why it happens and the exact fix.
You are seeing a PerimeterX (HUMAN) block because their bot detection flagged your traffic. The fix: use residential proxies with a stealth headless browser, handle the _px cookies, and mimic realistic browsing patterns.
PerimeterX scores datacenter IPs as high risk. Residential IPs lower your initial risk score.
PerimeterX requires JavaScript execution for its sensors. Use Puppeteer-extra-stealth or Playwright-stealth.
Navigate to the site homepage first. Let PerimeterX JavaScript run and set cookies before accessing protected pages.
Add mouse movement and scroll events to reduce behavioral anomaly scores.
If a challenge appears, simulate the press-and-hold interaction in the headless browser.
const puppeteer = require("puppeteer-extra");
const StealthPlugin = require("puppeteer-extra-plugin-stealth");
puppeteer.use(StealthPlugin());
const browser = await puppeteer.launch({
args: ["--proxy-server=gw.knoxproxy.com:7000"],
});
const page = await browser.newPage();
await page.authenticate({ username: "USER", password: "PASS" });
// Visit homepage first to establish PX cookies
await page.goto("https://px-protected.example/", {
waitUntil: "networkidle2",
});
await page.waitForTimeout(3000);
// Simulate human interaction
await page.mouse.move(200, 300);
await page.mouse.move(400, 500);
// Now access the protected page with established cookies
await page.goto("https://px-protected.example/products", {
waitUntil: "networkidle2",
});
const html = await page.content();
console.log(html); // Real product page
await browser.close();Test your setup with our proxy checker, then contact support if PerimeterX still won’t clear.
PerimeterX (now HUMAN Security) is a bot management platform that combines server-side signal analysis with client-side JavaScript sensors. When triggered, it serves a "Press & Hold" challenge or blocks with a custom error page. PerimeterX sets _px3 and _pxvid cookies and runs JavaScript that collects browser fingerprint data. It is commonly used by e-commerce, ticketing, and travel sites.
Use a headless browser or session that allows PerimeterX JavaScript to set its cookies on the first visit.
Use Puppeteer with stealth plugins to mask automation indicators.
Add human-like mouse movements and scroll events in your headless browser between page loads.
If PerimeterX blocks persist with stealth browser and residential proxies, the site may use HUMAN Bot Defender Enterprise. Contact KnoxProxy support for advanced integration assistance.
Look for _px3, _pxvid cookies in responses, or JavaScript files loaded from client.perimeterx.net. The block page often shows "Press & Hold" or a PerimeterX-branded challenge.
Yes. PerimeterX rebranded to HUMAN Security in 2022. The technology and detection methods are the same. Documentation may reference either name.
In a headless browser, you can simulate the press-and-hold with page.mouse.down() and page.mouse.up() after a 2-3 second delay. But prevention (stealth browser + cookies) is more reliable.
KnoxProxy comes pre-configured to avoid the most common errors. Start a free trial and fix PerimeterX for good.