The use of free proxies does not guarantee privacy and anonymity when working on the network, they are unreliable sources for transmitting traffic.
When using pull ports, this error often occurs for the following reasons:
1. The checker shows that the proxy is alive, in fact the proxy is no longer working.
Solution to the problem: Check the availability of the proxy server on different checkers, if one shows what works (usually on the one that provided free proxies), check and make sure that this socks is valid in the other checker.
2. You are using a public proxy port, which is not supported by your internet connection for security.
Solution to the problem: Enter the desired port in the settings as a trusted port
3. Your operating system or browser settings do not support proxy protocol.
Solution to the problem: Turn on the proxying option in the operating system settings, because replace the browser. You can also try to work not with a computer, but with a phone.
4. Internet service provider or vpn blocks work through a proxy server.
Solution to the problem: Replace the Internet provider or VPN, or try to write in the shadow support to fix the problem.
Please see the simpler methods of working with proxy servers at the following link:
SOCKS v4/v5 on IE, FireFox, Chrome and Opera - Manual (Tutorial) As time advances, there are also developments within the web browser’s scene. These web browsers that we use nowadays keep on getting improvements as time passes by. Long ago, on their early sprout within the web and IT world...
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If the problem persists, use another proxy program.
Consider buying paid cheap proxies and working with their software, they work stably and do not cause problems, for example on 991.re
Technical support will solve any problems you may have.