Bruteforcing socks5 proxy

[Decklay]

Hello ya'll...
Zdrasti vsem....
U menya vopros ko vsem vam.
U menya est paru proxies socks5 server adresses, kogda ya vazu server v proxifier checker on mne pokazivaet shto server xoroshey e vso ok...
Kogda ya petayus zaiti v socks5 server 4erez browser, ya podklu4ayus k nemu e webpage na4inaet 3adruzatsa... no kogda ya petayus zaiti v drugoi website, on mne pishet connection is not secured e vebrasevaet menya s servera.
Moi vapros takoi, kak ya magu bruteforce login e pass shtobe zaiti v etot socks5 proxy e polzivatsa im?
Esli ktota 3naet kakoi to put ili posavetuet guide/ tutorial shtobe eto zdelat, ili xotya be napravet v nujnei naprovleniya?
I have a few socks5 proxies servers in mind that I need to connect to. When I type the server address and port in the proxifier checker It says all green and good to go... When I try to connect to the server via my browser the webpage loads up quickly and gives me the connection for a few quick moments... But when trying to connect to a different webpage it tells me that the connection is not secured and the certificate isnt valid.
What I have in mind is try to bruteforce the proxy and try to get the login and pass so I can use the proxy for my own browsing.
Is there any way to do so? Does anyone know where can I find a guide/ tutorial to do so? Or if anyone could at least steer me to the right direction to perform such a thing that would be greatly appreciated.
Thanks in advance...
Spasibo bratya...!!!
Cheeeeeeeeeeers.

[marjan]

here is the problem: guessing both username and password via bruteforce would take too much time. if we take in account the network latency the time needed increase drastically
in either case take a look at the rfc 1928 and implement the sock5 protocol, or just search for any library online that you can already use, then during the authentication just send whatever username and password you want and see the response packet for confirmation (if server send any, i didnt bothered reading the rfc for you)