Four Every Proxy

To check if a port is available over UDP, you can try binding to the port for a short period. If the binding is successful, the port is available. If it fails, the port is already in use. Here's a simple example in Python:

import socket

def is_port_available(port, host='127.0.0.1', timeout=2):
    with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
        try:
            sock.bind((host, port))
            sock.settimeout(timeout)
            return True
        except OSError:
            return False
        finally:
            sock.close()

if __name__ == "__main__":
    port = 12345
    if is_port_available(port):
        print(f"Port {port} is available.")
    else:
        print(f"Port {port} is not available.")

In this example, the is_port_available function creates a UDP socket and attempts to bind to the specified port and host. If the binding is successful, the function returns True, indicating that the port is available. If the binding fails, the function returns False, indicating that the port is already in use.

UDP Hole Punching is a technique used to establish a connection between two devices behind NAT (Network Address Translation) firewalls. It works by exploiting the fact that some UDP packets can still pass through the NAT firewall even if the source and destination ports are the same. However, UDP Hole Punching does not always bypass NAT for several reasons:

1. Symmetric NAT: In symmetric NAT, both the source and destination ports are translated, and the NAT firewall maintains a table of active connections. If the table is not updated correctly, UDP hole punching may not work.

2. Unstable NAT: Some NAT firewalls are known to be unstable, causing them to drop packets or change their behavior unexpectedly. This can lead to failure in establishing a connection using UDP hole punching.

3. Firewall rules: Some NAT firewalls have strict rules that prevent UDP hole punching from working. For example, if the firewall is configured to block all incoming UDP traffic, UDP hole punching will not be successful.

4. Timeout: NAT firewalls have a timeout for their connection tables. If the timeout occurs before the connection is established, UDP hole punching will fail.

5. Network congestion: If the network is congested, packets may be dropped or delayed, causing UDP hole punching to fail.

In summary, while UDP hole punching can be an effective technique for bypassing NAT, it does not always guarantee a successful connection due to various factors such as NAT behavior, firewall rules, and network conditions.

Setting up a proxy on your TV depends on the type of TV and the operating system it uses. Some smart TVs run on platforms like Android TV, webOS, or Tizen, which allow you to install apps and configure network settings. Here, I will provide instructions for popular smart TV platforms:

Android TV:
- Press the "Home" button on your remote control.
- Scroll up or down to "Apps" and highlight "Settings."
- Select "Network" or "Network & Internet."
- Choose "Advanced settings" or "More settings."
- Select "Manage proxy settings" or "Proxy settings."
- Choose "Enable proxy" and enter the proxy server address, port, and authentication credentials (if required).
- Save the settings and restart your TV if necessary.

webOS (LG Smart TV):
- Press the "Home" button on your remote control.
- Scroll up or down to "Settings" and select it.
- Choose "All Settings" or "General."
- Select "Network" or "Internet."
- Choose "Wi-Fi Direct" or "Wired" depending on your connection type.
- Select "Advanced settings" or "Internet settings."
- Choose "Manual proxy settings" and enter the proxy server address, port, and authentication credentials (if required).
- Save the settings and restart your TV if necessary.

Tizen (Samsung Smart TV):
- Press the "Menu" button on your remote control.
- Scroll up or down to "Settings" and select it.
- Choose "General" or "Network."
- Select "Network status" or "Internet."
- Choose "Wi-Fi" or "Wired" depending on your connection type.
- Select "Advanced settings" or "Internet settings."
- Choose "Manual proxy settings" and enter the proxy server address, port, and authentication credentials (if required).
- Save the settings and restart your TV if necessary.

Yes, it is possible to access blocked YouTube or channels unavailable in a certain country using a proxy.

HTTP proxies are used for surfing the Internet and working with social networks. However, when using this type of proxy, the user's IP address remains unprotected. At the same time, the connection speed remains high.
SOCKS proxy are designed to use programs and visit sites anonymously. Also this type of proxy allows bypassing the resources with proxy-server protection.
To sum up: SOCKS proxies are a more advanced development compared to HTTP. However, to use SOCKS, you must know how to configure your browser and use special utilities.