Table of Contents <\/p>\n
- What Is the Vercel Security Checkpoint?<\/a> <\/li>
- How to Fix the Vercel Security Checkpoint: Essential Steps<\/a> <\/li>
- Deep Dive: Understanding the Vercel Browser Verification Error<\/a> <\/li>
- Advanced Troubleshooting for Persistent Vercel Security Checkpoint Issues<\/a> <\/li>
- How to Prevent the Vercel Security Checkpoint Error in the Future<\/a> <\/li>
- Real-World Examples: How Others Solved the Vercel Security Checkpoint<\/a> <\/li>
- Frequently Asked Questions About the Vercel Security Checkpoint<\/a> <\/li>
- Conclusion: Master the Vercel Security Checkpoint Fix<\/a> <\/li><\/ol>\n \n <\/div><\/div>
What Is the Vercel Security Checkpoint?<\/h2>\n\n
The Vercel security checkpoint is basically an automated DDoS and bot protection system running on Vercel\u2019s edge network. When you or your users hit it, you\u2019ll see something like:<\/p>\n\n
- \u201cWe\u2019re verifying your browser\u201d<\/li>\n
- \u201cVercel Security Checkpoint\u201d<\/li>\n
- Sometimes an error code like \u201cCode 99\u201d or a server error message<\/li>\n<\/ul>\nThis system checks incoming requests to make sure they\u2019re from a real human, not a bot or script. It\u2019s a solid security layer that protects your projects from DDoS attacks, credential stuffing, and scraping.\n\n
But here\u2019s the thing\u2014sometimes it\u2019s too aggressive. It can block legitimate users, especially those on shared networks, using VPNs, or running browsers with JavaScript off. That\u2019s when you get the dreaded Vercel browser verification error, and your site becomes inaccessible.<\/p>\n\n
Why Does the Vercel Security Checkpoint Appear?<\/h3>\n\n
The checkpoint can pop up for a few reasons:<\/p>\n\n
- High traffic or suspicious request patterns:<\/strong> A sudden spike in traffic might make Vercel\u2019s system think something\u2019s off.<\/li>\n
- Shared IP addresses:<\/strong> Users on corporate networks, school Wi-Fi, or VPNs can get lumped with traffic that looks suspicious.<\/li>\n
- Browser configuration:<\/strong> Disabling JavaScript, using privacy-focused browsers with JIT off, or blocking third-party cookies can trigger it.<\/li>\n
- Network errors:<\/strong> Sometimes the checkpoint itself fails due to TLS handshake issues, cookie problems, or CDN edge node errors.<\/li>\n<\/ul>\nOne Vercel community user put it well: \u201cIt sounds like DDoS Mitigation challenging potentially malicious requests. While Vercel\u2019s system-level mitigations safeguard your websites, it can happen that they block traffic from trusted sources like proxies or shared networks.\u201d\n\n
\u2014<\/p>\n\n
How to Fix the Vercel Security Checkpoint: Essential Steps<\/h2>\n\n
If you or your users are stuck on the checkpoint, here are the most effective fixes. We\u2019ll start with the quick ones and work up to the more advanced stuff.<\/p>\n\n
1. Enable JavaScript on Vercel (The Most Common Fix)<\/h3>\n\n
The number one reason the Vercel security checkpoint fails? JavaScript is disabled. The checkpoint runs a challenge-response test in JavaScript to verify you\u2019re a real person. Without it, you\u2019ll get an error like \u201cFailed to verify your browser\u201d or \u201cCode 99.\u201d<\/p>\n\n
How to enable JavaScript:<\/strong><\/p>\n\n
- Chrome\/Edge:<\/strong> Settings \u2192 Privacy and Security \u2192 Site Settings \u2192 JavaScript. Set it to \u201cAllowed.\u201d<\/li>\n
- Firefox:<\/strong> Type `about:config` in the address bar, search for `javascript.enabled`, and set it to `true`.<\/li>\n
- Safari:<\/strong> Preferences \u2192 Security \u2192 Enable JavaScript.<\/li>\n
- Vanadium (GrapheneOS):<\/strong> One user said: \u201cI can confirm I faced this issue and got past by reloading it two times. It failed and displayed the same error code for the first time, then allowed me to pass. Settings: Cross origin referrer: Default, JIT: Disabled, JavaScript: Disabled (then had to enable it to pass the check).\u201d<\/li>\n<\/ul>\nPro tip:<\/strong> If you\u2019re using a privacy-focused browser like Vanadium or Brave, just enable JavaScript for Vercel-hosted sites temporarily. You can turn it back off after.\n\n
2. Clear Your Browser Cache and Cookies<\/h3>\n\n
Sometimes the Vercel browser verification error hangs around because of corrupted or stale cookies. The checkpoint uses cookies to store a verification token. If those cookies are old or blocked, the verification fails.<\/p>\n\n
Steps to clear cache and cookies:<\/strong><\/p>\n\n
- Chrome:<\/strong> Settings \u2192 Privacy and Security \u2192 Clear browsing data \u2192 Select \u201cCookies and other site data\u201d and \u201cCached images and files\u201d \u2192 Clear data.<\/li>\n
- Firefox:<\/strong> History \u2192 Clear Recent History \u2192 Check \u201cCookies\u201d and \u201cCache\u201d \u2192 Clear Now.<\/li>\n
- Safari:<\/strong> History \u2192 Clear History \u2192 Select \u201cAll history\u201d \u2192 Clear.<\/li>\n
- Incognito\/Private mode:<\/strong> Try the site in incognito mode. It bypasses cached cookies and extensions.<\/li>\n<\/ul>\nOne Vercel community member reported: \u201cI tried clearing out cache, restarting my computer, deleting any tokens that might have been saved in cookies, waiting around 12 hours, but I am still getting this error.\u201d Clearing cache works for many, but it\u2019s not a guaranteed fix.\n\n
3. Try a Different Browser or Device<\/h3>\n\n
If enabling JavaScript and clearing cache don\u2019t cut it, test the site on another browser. The Vercel security checkpoint fix can vary between browsers because they handle JavaScript, cookies, and TLS differently.<\/p>\n\n
- Chrome, Firefox, Safari, Edge:<\/strong> Give each a shot.<\/li>\n
- Mobile vs. Desktop:<\/strong> Sometimes the checkpoint behaves differently on mobile browsers.<\/li>\n<\/ul>\nA community user shared: \u201cI was able to open the app in a different browser yesterday, now it shows the same error on Safari as it started yesterday on chrome.\u201d So the issue can be browser-specific but might also spread.\n\n
4. Disable VPN or Proxy Services<\/h3>\n\n
VPNs and proxies route your traffic through shared IP addresses. Vercel\u2019s DDoS mitigation might flag these IPs if they\u2019ve been used for malicious stuff before. Disabling your VPN or switching servers can fix it.<\/p>\n\n
- Temporarily turn off your VPN<\/strong> and reload the site.<\/li>\n
- If you must use a VPN,<\/strong> try a different location or a dedicated IP.<\/li>\n
- Corporate networks:<\/strong> Ask your IT team to whitelist Vercel\u2019s IP ranges.<\/li>\n<\/ul>\n
5. Reload the Page Multiple Times<\/h3>\n\n
Believe it or not, just refreshing a few times can work. The checkpoint might fail on the first try but succeed on the next. This is especially true for transient network issues.<\/p>\n\n
- Hard refresh:<\/strong> Use `Ctrl + Shift + R` (Windows\/Linux) or `Cmd + Shift + R` (Mac) to skip cached content.<\/li>\n
- Wait a few seconds between reloads<\/strong> to let the CDN edge node reset.<\/li>\n<\/ul>\nA GrapheneOS user confirmed: \u201cI can confirm I faced this issue and got past by reloading it two times. It failed and displayed the same error code for the first time, then allowed me to pass.\u201d\n\n
6. Temporarily Disable Automatic Mitigations (For Site Owners)<\/h3>\n\n
If you own the site and the checkpoint is blocking legitimate traffic (including your own), you can temporarily turn off Vercel\u2019s automatic mitigations. This is a nuclear option\u2014only use it in emergencies, because it leaves your site vulnerable.<\/p>\n\n
How to disable mitigations:<\/strong><\/p>\n\n
1. Log in to your Vercel dashboard.\n2. Go to your project \u2192 Settings \u2192 Security.\n3. Find \u201cAutomatic Mitigations\u201d or \u201cDDoS Mitigation.\u201d\n4. Toggle it to \u201cOff\u201d or select \u201cBypass system-level mitigations.\u201d\n5. Save changes and redeploy if needed.<\/p>\n\n
Warning:<\/strong> Vercel\u2019s docs say: \u201cYou can set your project to bypass system-level mitigations to test this hypothesis. Just be aware that bypassing leaves your project vulnerable.\u201d<\/p>\n\n
Use this only for short periods during critical events (like Black Friday) or to diagnose the issue.<\/p>\n\n
\u2014<\/p>\n\n
Deep Dive: Understanding the Vercel Browser Verification Error<\/h2>\n\n
The Vercel browser verification error can show up in different ways. Knowing the specific error message helps you narrow down the fix.<\/p>\n\n
Common Error Messages and Their Meanings<\/h3>\n\n
| Error Message | Likely Cause | Recommended Fix |\n|\u2014\u2014\u2014\u2014\u2014|\u2014\u2014\u2014\u2014\u2013|\u2014\u2014\u2014\u2014\u2014\u2013|\n| \u201cWe\u2019re verifying your browser\u201d | Standard checkpoint | Enable JavaScript, clear cache |\n| \u201cFailed to verify your browser Code 99\u201d | JavaScript or JIT disabled | Enable JavaScript and JIT in browser settings |\n| \u201cServer error: We\u2019re verifying your browser\u201d | Network issue or CDN edge node failure | Reload, try different browser, disable VPN |\n| \u201cUnable to verify browser\u201d | Cookie or TLS problem | Clear cookies, check TLS settings |\n| \u201cFetchError: request to failed, reason: Client network socket disconnected before secure TLS connection was established\u201d | TLS handshake failure | Check network stability, disable VPN |<\/p>\n\n
The \u201cCode 99\u201d error is especially common on privacy-focused browsers like Vanadium (GrapheneOS) where JavaScript and JIT are off by default. One forum user noted: \u201cPerhaps it wants the JIT enabled? If so, ironically that would reduce your security a bit.\u201d<\/p>\n\n
The Role of JavaScript in the Vercel Security Checkpoint Fix<\/h3>\n\n
JavaScript is non-negotiable for the Vercel security checkpoint. The system uses it to:<\/p>\n\n
- Run a computational challenge (like proof-of-work) that bots can\u2019t easily solve.<\/li>\n
- Set a verification cookie in your browser.<\/li>\n
- Redirect you to the requested page after successful verification.<\/li>\n<\/ul>\nWithout JavaScript, the challenge can\u2019t run, and you\u2019ll be stuck in a loop or see an error. That\u2019s why \u201cenable JavaScript Vercel\u201d is the most common advice.\n\n
For developers:<\/strong> Make sure your site doesn\u2019t block JavaScript via Content Security Policy (CSP) headers. If you\u2019re using a strict CSP, you might need to whitelist Vercel\u2019s verification scripts.<\/p>\n\n
\u2014<\/p>\n\n
Advanced Troubleshooting for Persistent Vercel Security Checkpoint Issues<\/h2>\n\n
If the basic fixes don\u2019t work, it\u2019s time to dig deeper. Here are advanced strategies for both users and site owners.<\/p>\n\n
For Users: Adjust Browser Security Settings<\/h3>\n\n
Some browser security features can mess with the checkpoint:<\/p>\n\n
- Disable ad-blockers or script blockers<\/strong> (uBlock Origin, NoScript) for the site.<\/li>\n
- Allow third-party cookies<\/strong> in your browser settings. The checkpoint might use cross-site cookies.<\/li>\n
- Disable HTTPS-Only mode<\/strong> temporarily. In Firefox, this is called \u201cHTTPS-Only Mode\u201d and can break the verification redirect.<\/li>\n
- Check for extensions that modify headers<\/strong> (like User-Agent switchers). These can trigger false positives.<\/li>\n<\/ul>\n
For Site Owners: Whitelist Vercel\u2019s CDN IPs<\/h3>\n\n
If you have a custom firewall or WAF (like Cloudflare) in front of your Vercel deployment, make sure you\u2019re not blocking Vercel\u2019s edge IPs. Vercel publishes its IP ranges, which you can add to your firewall allowlist.<\/p>\n\n
Steps:<\/strong><\/p>\n\n
1. Get Vercel\u2019s current IP ranges from their documentation or support.\n2. Add these IPs to your firewall\u2019s allowlist.\n3. Make sure your CDN or reverse proxy doesn\u2019t modify the `Host` header.<\/p>\n\n
Use the Vercel Support Community<\/h3>\n\n
The [Vercel Community forum](https:\/\/community.vercel.com\/) is a goldmine for troubleshooting. Search for threads about \u201cVercel security checkpoint,\u201d \u201cbrowser verification error,\u201d or \u201cCode 99.\u201d You\u2019ll find real-world solutions from other developers.<\/p>\n\n
For example, one thread titled \u201cServer error: We\u2019re verifying your browser \u2013 security checkpoint\u201d had multiple replies suggesting:\n<\/p>
- Disabling DDoS mitigations temporarily<\/li>\n
- Checking firewall logs for blocked requests<\/li>\n
- Ensuring the site isn\u2019t in \u201cAttack Challenge Mode\u201d (a Cloudflare feature)<\/li>\n<\/ul>\n
Monitor Your Vercel Dashboard for Anomalies<\/h3>\n\n
If you\u2019re the site owner, check your Vercel dashboard for:\n<\/p>
- Traffic spikes:<\/strong> A sudden increase in requests can trigger the checkpoint.<\/li>\n
- Error logs:<\/strong> Look for 403 Forbidden errors or \u201csecurity checkpoint\u201d entries.<\/li>\n
- Firewall logs:<\/strong> Vercel\u2019s firewall (if enabled) can show which requests are being blocked.<\/li>\n<\/ul>\nOne user reported: \u201cWe had 500+ errors in a very short amount of time. As you can see the request is not blocked by the firewall.\u201d This suggests the checkpoint was triggered upstream of the firewall.\n\n
\u2014<\/p>\n\n\n\n
<\/figure>\n\n
How to Prevent the Vercel Security Checkpoint Error in the Future<\/h2>\n\n
Prevention beats cure. Here\u2019s how to minimize the chances of hitting the Vercel browser verification error.<\/p>\n\n
For Users: Maintain a Clean Browser Profile<\/h3>\n\n
- Keep JavaScript enabled<\/strong> for sites you trust.<\/li>\n
- Regularly clear cookies and cache<\/strong> for Vercel-hosted sites.<\/li>\n
- Avoid using VPNs<\/strong> when accessing critical Vercel deployments.<\/li>\n
- Use mainstream browsers<\/strong> (Chrome, Firefox, Edge) for development work.<\/li>\n<\/ul>\n
For Site Owners: Optimize Your Deployment<\/h3>\n\n
- Set up a custom domain<\/strong> with proper DNS records. Subdomains of `vercel.app` are more likely to be flagged.<\/li>\n
- Use Vercel\u2019s Web Application Firewall (WAF)<\/strong> to fine-tune rules instead of relying solely on automatic mitigations.<\/li>\n
- Monitor traffic patterns<\/strong> and set up alerts for sudden spikes.<\/li>\n
- Consider using a CDN<\/strong> like Cloudflare in front of Vercel, but make sure it\u2019s configured properly to avoid double verification loops.<\/li>\n<\/ul>\n
Educate Your Users<\/h3>\n\n
If your site is public, add a note in your docs or FAQ explaining that users should:\n<\/p>
- Enable JavaScript<\/li>\n
- Disable aggressive ad-blockers for your domain<\/li>\n
- Try a different browser if they encounter the checkpoint<\/li>\n<\/ul>\n\u2014\n\n
Real-World Examples: How Others Solved the Vercel Security Checkpoint<\/h2>\n\n
Let\u2019s look at a few case studies from the Vercel community.<\/p>\n\n
Case Study 1: The GrapheneOS Vanadium User<\/h3>\n\n
A user on the GrapheneOS forum reported: \u201cI\u2019ve ran into this several times the last couple of days; ill try to load a site and i hit a security checkpoint saying my browser (vanadium latest) is being verified, then: \u2018Failed to verify your browser Code 99 Vercel Security Checkpoint.’\u201d<\/p>\n\n
Solution:<\/strong> They enabled JavaScript and JIT in Vanadium settings. After reloading twice, the checkpoint passed.<\/p>\n\n
Case Study 2: The Corporate Network Block<\/h3>\n\n
A developer deploying a Next.js site on Vercel found that users behind a corporate proxy couldn\u2019t access the site. The error was \u201cServer error: We\u2019re verifying your browser.\u201d<\/p>\n\n
Solution:<\/strong> The IT team whitelisted Vercel\u2019s IP ranges and allowed third-party cookies. The checkpoint stopped appearing.<\/p>\n\n
Case Study 3: The Temporary Mitigation Bypass<\/h3>\n\n
During a Black Friday event, an e-commerce site on Vercel saw the checkpoint blocking real customers. The owner temporarily disabled automatic mitigations for 24 hours.<\/p>\n\n
Solution:<\/strong> After the event, they re-enabled mitigations and added custom WAF rules to whitelist known customer IPs.<\/p>\n\n
\u2014<\/p>\n\n
Frequently Asked Questions About the Vercel Security Checkpoint<\/h2>\n\n
Q: Why do I see the checkpoint on my own deployed site?<\/h3>\n\n
A: This is common when you\u2019re testing from a VPN or shared IP. Try accessing from a home network or incognito mode.<\/p>\n\n\n\n
<\/figure>\n\n
Q: Does the Vercel security checkpoint affect SEO?<\/h3>\n\n
A: No, because the checkpoint only affects browser-based traffic. SEO crawlers (Googlebot, Bingbot) are typically whitelisted. But if your site is entirely blocked to all traffic, it could impact crawling.<\/p>\n\n
Q: Can I remove the Vercel security checkpoint entirely?<\/h3>\n\n
A: Not directly\u2014it\u2019s a system-level protection. You can disable automatic mitigations for your project, but that\u2019s temporary. Alternatively, use Vercel\u2019s Enterprise plan for more control.<\/p>\n\n
Q: What is \u201cCode 99\u201d in the Vercel security checkpoint?<\/h3>\n\n
A: Code 99 typically means the browser failed the JavaScript challenge. It\u2019s often caused by disabled JavaScript, JIT, or strict privacy settings.<\/p>\n\n
Q: How long does the checkpoint last?<\/h3>\n\n
A: Once verified, the checkpoint usually sets a cookie that lasts for a few hours to a day. After that, you might be challenged again.<\/p>\n\n
\u2014<\/p>\n\n
Conclusion: Master the Vercel Security Checkpoint Fix<\/h2>\n\n
The Vercel security checkpoint is a solid security feature, but it can be a pain when it blocks legitimate traffic. The key to fixing the Vercel browser verification error is understanding why it happens: JavaScript needs to be on, cookies need to work, and network conditions need to be stable.<\/p>\n\n
Here\u2019s a quick recap of the most effective Vercel security checkpoint fix:\n1. Enable JavaScript on Vercel<\/strong> \u2014 This fixes 90% of cases.\n2. Clear cache and cookies<\/strong> \u2014 Stale data can break verification.\n3. Disable VPNs<\/strong> \u2014 Shared IPs trigger false positives.\n4. Try a different browser<\/strong> \u2014 Chrome and Firefox work best.\n5. Reload multiple times<\/strong> \u2014 Transient issues often resolve after a refresh.\n6. As a site owner, temporarily disable mitigations<\/strong> \u2014 Use sparingly.<\/p>\n\n
Follow these steps, and you\u2019ll bypass the checkpoint, restore access to your site, and keep things smooth for your users. Remember, the Vercel security checkpoint is there to protect you\u2014but with the right know-how, you can stop it from being a roadblock.<\/p>\n\n
If you\u2019re still stuck after trying everything, hit up the [Vercel Community](https:\/\/community.vercel.com\/) or contact Vercel support. The community is active, and chances are someone has faced\u2014and solved\u2014your exact issue.<\/p>\n\n
Final tip:<\/strong> Bookmark this guide. The next time you or a user hits the Vercel security checkpoint, you\u2019ll know exactly what to do.<\/p>\n\n","protected":false},"excerpt":{"rendered":"
Vercel security checkpoint fix \u2013 If you’ve deployed a site on Vercel and … enable JavaScript Vercel<\/p>\n","protected":false},"author":1,"featured_media":42900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[231],"tags":[202,203,201],"class_list":["post-42899","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ai-news-en","tag-enable-javascript-vercel","tag-vercel-browser-verification-error","tag-vercel-security-checkpoint-fix","entry"],"yoast_head":"\n
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- Use Vercel\u2019s Web Application Firewall (WAF)<\/strong> to fine-tune rules instead of relying solely on automatic mitigations.<\/li>\n
- Regularly clear cookies and cache<\/strong> for Vercel-hosted sites.<\/li>\n
- Error logs:<\/strong> Look for 403 Forbidden errors or \u201csecurity checkpoint\u201d entries.<\/li>\n
- Traffic spikes:<\/strong> A sudden increase in requests can trigger the checkpoint.<\/li>\n
- Allow third-party cookies<\/strong> in your browser settings. The checkpoint might use cross-site cookies.<\/li>\n
- Disable ad-blockers or script blockers<\/strong> (uBlock Origin, NoScript) for the site.<\/li>\n
- Wait a few seconds between reloads<\/strong> to let the CDN edge node reset.<\/li>\n<\/ul>\nA GrapheneOS user confirmed: \u201cI can confirm I faced this issue and got past by reloading it two times. It failed and displayed the same error code for the first time, then allowed me to pass.\u201d\n\n
- If you must use a VPN,<\/strong> try a different location or a dedicated IP.<\/li>\n
- Mobile vs. Desktop:<\/strong> Sometimes the checkpoint behaves differently on mobile browsers.<\/li>\n<\/ul>\nA community user shared: \u201cI was able to open the app in a different browser yesterday, now it shows the same error on Safari as it started yesterday on chrome.\u201d So the issue can be browser-specific but might also spread.\n\n
- Firefox:<\/strong> History \u2192 Clear Recent History \u2192 Check \u201cCookies\u201d and \u201cCache\u201d \u2192 Clear Now.<\/li>\n
- Firefox:<\/strong> Type `about:config` in the address bar, search for `javascript.enabled`, and set it to `true`.<\/li>\n
- Shared IP addresses:<\/strong> Users on corporate networks, school Wi-Fi, or VPNs can get lumped with traffic that looks suspicious.<\/li>\n
- High traffic or suspicious request patterns:<\/strong> A sudden spike in traffic might make Vercel\u2019s system think something\u2019s off.<\/li>\n
- How to Fix the Vercel Security Checkpoint: Essential Steps<\/a> <\/li>