Holy Unblocker works with many websites, but it is normal for some sites or individual features to fail in a browser proxy. A site may load partly, show a blank screen, hang, show a CAPTCHA, return a 502 error, or work fine outside Holy Unblocker and fail inside it. That doesn't mean the proxy is completely down.
Modern sites combine JavaScript, APIs, cookies, WebSockets, authentication and security policies, and a browser proxy has to process all of it. The project lineage continues as InvisiProxy LTS (see Holy Unblocker vs InvisiProxy), and its documentation acknowledges that CAPTCHA support is inconsistent and some sites may not work through the available engines.
Start here: if every site fails, suspect the proxy or your browser. If only one site fails, suspect that site's compatibility. For a broader checklist, see 10 common problems and fixes.
Why Don't Websites Work on Holy Unblocker?
There isn't one reason. A site can fail because of proxy compatibility, JavaScript, CAPTCHA, WebSockets, authentication, browser compatibility, cached data, proxy-server errors, site-side restrictions or heavy architecture. What matters is finding where the problem occurs.
1. The Site Isn't Fully Compatible With the Proxy
The most common cause. Scramjet's approach combines interception, rewriting and sandboxing (see how Holy Unblocker works), which suits many sites, but a site can depend on unusual technologies:
- Complex JavaScript and dynamic API requests
- WebSockets and browser storage
- Strict security policies and authentication systems
- Embedded third-party services
If one important part can't be processed, the page may only partly work. Try another site first. If others work normally, the cause is that specific site.
2. JavaScript Problems
A modern web app uses JavaScript for navigation, login, search, API calls, interfaces, video players and real-time updates. If the proxy can't handle how a site uses it, you may see blank pages, buttons that do nothing, missing content, endless loading, broken menus or failed logins. Refresh, then try another browser, clear site data, try another engine and test a different site.
3. CAPTCHA May Not Work
CAPTCHAs check whether a visitor is a real user, and a proxy can trigger them because the site sees an unfamiliar network environment. The documentation notes CAPTCHA support is inconsistent across proxy implementations, with Scramjet offering the strongest support. You may see loops, CAPTCHAs that never load, "verify you are human" prompts or pages that never progress.
- Reload, or try another available engine or browser.
- Wait and try later.
- Don't keep refreshing the verification page, which can make it worse.
If the CAPTCHA itself is incompatible, there may be no reliable client-side fix.
4. The Site Uses WebSockets
WebSockets keep a persistent two-way connection, and chat apps, multiplayer games, dashboards, collaboration tools and notifications use them. A site can load and log you in while its real-time features fail (chat doesn't update, a multiplayer connection drops). The first HTTP requests may work while the persistent connection doesn't. Try a simpler mode of the site, or another engine or transport if offered.
5. The Site Blocks or Restricts Proxy Traffic
Some sites restrict proxy traffic for reasons such as abuse prevention, bot protection, rate limiting, fraud prevention, geographic rules or network reputation. If it works directly but fails through Holy Unblocker while other sites work through it, the problem is specific to that destination's handling of the proxy, not necessarily a Holy Unblocker fault.
6. Strict Security Policies
Browsers and sites enforce policies affecting cross-origin requests, cookies, scripts, embedded content, frames, API requests and resource loading. A proxy changes the environment those resources are requested in, so a site may load its HTML but fail to load an API or script it needs.
7. Login and Authentication Break
Login systems are sensitive to proxy environments. Secure cookies, tokens, OAuth, third-party identity providers, device checks and security challenges can all fail, producing login loops, "session expired" messages, blank login pages or sudden logouts. First check that the site works without the proxy. If direct access works but authentication always fails through the proxy, the login system likely isn't compatible. For important accounts, avoid entering sensitive credentials on an untrusted public proxy (see our disclaimer).
8. Your Browser or Cached Data
Sometimes the site isn't the problem. Outdated cache, corrupted site data, conflicting extensions, disabled JavaScript, service-worker issues or old browser components can all break things. Proxy apps use service workers and client-side resources, and old cached ones can conflict with a newer deployment, which is a common reason something that worked yesterday fails today.
- Open Holy Unblocker in a private window. If the site works, an extension or stored data was the cause.
- Try another browser, such as Firefox or Edge if you use Chrome.
- Close the tab, clear site data for the deployment, reopen the browser and reload. You don't need to delete your whole history.
9. A 502 Error
A 502 Bad Gateway generally means a problem between the client and the upstream server. The documentation recommends trying another site or waiting, and says clearing the cache can sometimes help. Refresh, try another site, clear the relevant cached data, then wait. If many sites return 502 at once, the deployment is more likely at fault than the destination.
10. The Server Is Overloaded
Public proxy servers have limited resources. Heavy use can mean high CPU and memory use, connection limits, slow responses and timeouts. Signs include several slow sites, long delays before pages finish loading, slow images, intermittent 502s or timeouts, and the same site being faster later. Changing browser settings won't solve this. Waiting or using another legitimate deployment may.
11. The Site Is Too Complex
A simple site is HTML with CSS, images and basic JavaScript. A complex web app adds large JavaScript bundles, APIs, WebSockets, authentication, cookies, dynamic imports, service workers, third-party scripts and media. More parts mean more places for compatibility to break, which is why a basic site can work perfectly while a complex app doesn't.
12. The Engine and Browser Matter
InvisiProxy includes Scramjet and Ultraviolet, and older versions also used Rammerhead. Different engines behave differently on some sites, so a site failing in one doesn't mean it fails in all. Compare engines if your deployment offers a choice (see Holy Unblocker vs Scramjet).
Browsers differ too. Proxies rely on service workers, JavaScript, WebAssembly, storage and network APIs, and the roadmap includes Firefox and mobile work. Test Chrome, Edge, Firefox or another Chromium browser to see whether compatibility is responsible. On mobile, update the browser, close tabs, clear site data, try another mobile browser and test the same site on desktop.
Why YouTube, Discord, Reddit and Similar Sites Behave Differently
Large platforms are especially complex, using multiple APIs, authentication, dynamic JavaScript, content delivery networks, security systems, streaming, WebSockets and anti-bot measures. Historical Holy Unblocker documentation lists YouTube, Discord, Google, Reddit and Bing among supported sites, and Ultraviolet and Scramjet publish their own supported-site information. But supported doesn't mean every feature always works, because a site can change its architecture at any time. See the supported sites table, and Holy Unblocker Games for games.
How to Find Out Why a Site Isn't Working
Instead of changing settings at random, run this test:
Quick Fixes
- Refresh the page. A temporary failure may disappear.
- Clear site data for the proxy.
- Try another browser and another website.
- Try another proxy engine if offered.
- Wait on a 502, since it may be temporary.
- Check the destination directly. If it's down without the proxy, Holy Unblocker isn't responsible.
- Don't keep refreshing CAPTCHA pages.
Why Changing the Proxy Doesn't Always Help
If the destination actively restricts proxy traffic, another browser-based proxy will probably hit the same restriction. If a site needs a browser feature that doesn't fit the proxy architecture, switching deployments may not solve it either. Identify the actual cause first.
Is It Holy Unblocker or the Website?
| Situation | Most likely cause |
|---|---|
| Holy Unblocker itself won't load | Proxy, browser or network |
| Every website fails | Proxy or browser problem |
| Only one website fails | Website compatibility |
| Site loads but buttons don't work | JavaScript compatibility |
| CAPTCHA keeps appearing | CAPTCHA/proxy compatibility |
| 502 error | Proxy or upstream issue |
| Works on desktop but not mobile | Browser/device compatibility |
| Works directly but not through the proxy | Proxy compatibility or restriction |
| Everything is extremely slow | Server, network or transport |
| Login keeps redirecting | Authentication/cookie compatibility |
When There Is Nothing You Can Fix
Sometimes a site simply isn't compatible with the current proxy implementation. If you've tested another browser, cleared site data, tried another site and the destination directly, tried another engine and confirmed your connection, and it still fails, the limit is the proxy-to-site compatibility itself. More browser tweaks are unlikely to help, but a future update to the proxy or the site may change the result.
Frequently Asked Questions
Why don't websites work on Holy Unblocker?
JavaScript compatibility, CAPTCHA systems, WebSockets, authentication, security policies, proxy restrictions, browser issues, server errors or complex site architecture.
Why does it work with some sites but not others?
Every site uses a different mix of technologies, so a proxy may support one well and struggle with another.
Why do I keep getting CAPTCHA?
CAPTCHA systems can behave poorly in proxy environments, and the official documentation acknowledges inconsistent support across implementations.
What does a 502 error mean?
A problem communicating with an upstream server. The documentation recommends trying another site, waiting, and sometimes clearing cached data.
Can changing browsers fix it?
Sometimes. Browser-specific service-worker, storage, JavaScript or compatibility issues can affect how a proxy operates.
Why does a site work directly but not through Holy Unblocker?
The destination may restrict proxy traffic, or one of its technologies may not be fully compatible with the proxy environment.
Why do games sometimes fail?
Games can depend on heavy JavaScript, WebSockets and low-latency connections, which are harder to proxy reliably.
Do all engines support the same sites?
Not necessarily. Compatibility differs between engines, so testing another available one can help.
Final Thoughts
If a site doesn't work on Holy Unblocker, that doesn't mean Holy Unblocker is broken. The most common reason is site compatibility. Start by working out whether the problem affects every website or just one. If everything fails, look at your browser, network or the deployment. If only one fails, suspect compatibility or destination-side restrictions. For temporary errors like 502s, refresh, clear relevant cached data, try another site and wait.
Don't assume a proxy must support every site just because it supports many popular ones. Compatibility is an ongoing process, and changes to the proxy software or the destination can change whether a service works.