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You can check the validity of proxies by using special software and a proxy checker. These tools not only check if the proxy is working, but also inform you about possible blocking by various platforms and social networks. Online services (checkers) also provide information related to ping, speed, proxy anonymity level, and geo. The combination of all these data allows for the most objective assessment of a proxy server's performance.

First you should check if its characteristics are correct. Some proxy servers are just IP address and port number, others use so called "connection script". You need to double-check that the data was entered correctly.

To count the number of lost packets over UDP, you can use a combination of network monitoring tools and custom scripts. Here's a step-by-step guide to help you achieve this:

1. Install a network monitoring tool:

You can use a network monitoring tool like Wireshark, tcpdump, or ngrep to capture the UDP packets on your network. These tools allow you to analyze the packets and identify lost packets.

2. Capture UDP packets:

Use the network monitoring tool to capture the UDP packets on the interface where the communication is taking place. For example, if you're monitoring a local server, you might use tcpdump with the following command:

tcpdump -i eth0 udp and host 192.168.1.100

Replace eth0 with the appropriate interface name and 192.168.1.100 with the IP address of the server you're monitoring.

3. Analyze the captured packets:

Once you have captured the UDP packets, analyze them to identify the lost packets. You can do this by looking for the sequence numbers in the UDP packets. If the sequence number of a packet is not consecutive to the previous packet, it means the packet was lost.

4. Write a custom script:

You can write a custom script in a language like Python to parse the captured packets and count the lost packets. Here's an example of a simple Python script that counts lost packets:

import re

def count_lost_packets(packet_data):
    sequence_numbers = re.findall(r'UDP, src port \((\d+)\)', packet_data)
    lost_packets = 0

    for i in range(1, len(sequence_numbers)):
        if int(sequence_numbers[i]) != int(sequence_numbers[i - 1]) + 1:
            lost_packets += 1

    return lost_packets

# Read the captured packets from a file
with open('captured_packets.txt', 'r') as file:
    packet_data = file.read()

# Count the lost packets
lost_packets = count_lost_packets(packet_data)
print(f'Number of lost packets: {lost_packets}')

Replace 'captured_packets.txt' with the path to the file containing the captured packets.

5. Run the script:

Run the script to count the lost packets. The script will output the number of lost packets in the captured data.

Connect your computer to a functioning router, then open any browser, go to the settings and enable manual configuration. Specify the IP, gateway with DNSI and subnet mask in the appropriate fields. In the "Home network" tab, under "Computers", go to "IPMP Proxy" and turn off this function. Under "System", click on the gear symbol, and under "Components", specify the Proxy UDP HTTP utility and click "Refresh".

It means a private proxy server used by several users. For example, one of them has bought a paid proxy and lets his friend use it for a fee. That is, he "shared" his proxy (shared means "common").