Proxies and blocks: why do websites “argue” and how can this be circumvented?

Roman

Sep 17, 2025

Proxy

### **Proxies and blocks: why do websites “fight” and how can you get around it?**

There is a constant, invisible battle going on in the digital space. On one side are web resources protecting their data and infrastructure. On the other are automated systems, marketers, analysts, and ordinary users seeking access to information. The main battlefield in this struggle is your access. And the main marker by which you are judged is your IP address and dozens of other digital “clues.”

Blocking is not an accident, but the result of complex, multi-level protection systems. To learn how to bypass them, you first need to understand how they think. In this article, we will conduct an in-depth technical analysis of blocking mechanisms and explain why a high-quality proxy is only half the solution.

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#### **Part 1. Anatomy of blocking: how anti-fraud systems make decisions**

Modern protection systems (WAF — Web Application Firewall, anti-fraud systems from Cloudflare, Akamai, Imperva) analyze not just one parameter, but a combination of signals. The decision to block is a verdict based on a comprehensive assessment of your visit.

##### **1.1. IP address reputation: your digital passport

The IP address is the first thing the server sees. Its analysis is the first and most important line of defense.

* **Classification by ASN (Autonomous System Number):** Each IP address belongs to a specific autonomous system — the network of a specific provider. Anti-fraud systems have databases of all ASNs in the world. If your ASN belongs to a hosting provider (e.g., Amazon Web Services, DigitalOcean, Hetzner), the system instantly marks your traffic as “server” or “non-resident.” This is a huge red flag, as real users rarely access the network from data centers. That is why **free and cheap proxies hosted on servers are a guaranteed way to get blocked quickly.**
* **IP Reputation & Blacklisting:** Every IP address has a history. If it has previously been used for spamming, DDoS attacks, or parsing attempts, it will be added to global blacklists (DNSBL — DNS-based Blackhole List). Requests from IP addresses with a bad reputation will either be rejected immediately or subjected to the most rigorous checks.
* **Rate Limiting:** This is a server policy that limits the number of requests from a single IP address over a certain period of time. Exceeding the limit (for example, 100 requests per minute) is the simplest and most obvious trigger for temporary or permanent blocking.

##### **1.2. Fingerprinting: analyzing your digital fingerprint**

If an IP address is your passport, then a fingerprint is your biometric data. It is a unique set of characteristics of your browser and operating system that allows you to be identified with the highest accuracy, even if you change your IP.

Advanced systems analyze:

* **HTTP Headers:**
  * **User-Agent:** A string that identifies your browser and OS. Mass requests with the same or outdated User-Agent are a clear sign of a bot.
  * **Accept-Language, Accept-Encoding:** Preferred languages and data compression methods.
* **Data congruence:** The system compares data. If the IP address is from Germany, but `Accept-Language` is `ru-RU` and the system time (Timezone) is `UTC+3`, this raises suspicion. All parameters must be congruent, i.e., they must match each other.
* **Active fingerprints (Canvas & WebGL Fingerprinting):** These are more complex techniques. The site asks your browser to render a hidden image (Canvas) or a 3D scene (WebGL). Due to differences in drivers, video cards, and operating systems, the resulting image will have a unique hash — a virtually unique identifier for your device.
* **Browser and OS settings:** Screen resolution, color depth, installed fonts, plugins — all of this adds up to a unique fingerprint.

##### **1.3. Behavioral analysis**

The highest level of modern anti-fraud systems is the analysis of user behavior on the page. Using JavaScript scripts, they track:

* **Mouse movements:** A real user moves the cursor smoothly, with micro-pauses. A bot either does not move it at all or moves it in a straight line at an unnatural speed.
* **Typing speed and rhythm.**
* **Navigation patterns:** A human reads, scrolls, and clicks on links. A bot moves through pages instantly and according to a predefined algorithm.

Based on this data, neural networks calculate a “human score.” If it is low, welcome to the ban list.

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#### **Part 2. Proxies as a bypass tool: from theory to practice**

Now that we understand the logic of protection, it becomes clear that simply changing your IP address is not enough to bypass it. You need to manage the entire set of digital identifiers. And proxies are the foundation here.

##### **2.1. Proxy hierarchy: why quality is everything**

* **Data center (DC) proxies:** As we have already established, their ASN is a stigma. They may work on websites with primitive protection, but on serious resources, they will be blocked at the first stage of verification.
* **Residential proxies:** IP addresses of real home Internet providers. Their ASN is “clean” and trustworthy. For the server, you are a regular user from the desired country. This is the **gold standard** for parsing and multi-accounting. **Rotating residential proxies**, which automatically change the IP for each request, allow you to effectively bypass rate limiting.
* **Mobile proxies:** IP addresses of mobile operators. They have the **highest level of trust**. One mobile IP address can be used simultaneously by thousands of subscribers within NAT (Network Address Translation) technology, so blocking such an address for a resource is an extremely risky move. This is the **ultimate solution** for working with the most secure platforms, such as social networks.

##### **2.2. Bypass strategy: tool synergy**

Even the best proxy is not a panacea on its own. Successful bypassing of blocks is the synergy of three components:

1. **High-quality proxy (mobile or residential):** Provides a trusted IP address from the desired geolocation.
2. **Anti-detection browser or competent parser:** Manages your fingerprint. It replaces the User-Agent, Canvas, WebGL, fonts, and other parameters, creating a unique and, most importantly, congruent digital fingerprint that matches the IP address.
3. **Well-thought-out behavior logic:** Your script or you yourself must imitate human actions: use pauses between requests (delays), “warm up” accounts, imitate mouse movements if necessary.

### **Conclusion**

Blocking on a website is not a mistake, but the result of a complex, multi-factor analysis. Modern protection systems see not only your IP address, but also your digital “portrait.” Trying to save money by using cheap data center proxies is like trying to get past face control at an elite club wearing a carnival mask — you'll be spotted immediately.

Successful work in conditions of constant blocking requires a comprehensive approach: using [**high-quality residential or mobile proxies from CyberYozh App**](https://app.cyberyozh.com/catalog/) to build trust and applying specialized tools to manage your digital footprint. This is the only way to stay one step ahead in this endless technological race.

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