@bobbylo
Proxies are like women; they are fickle! especially the free proxies - that's why you have to constantly update them - In my case I have about 3000 proxies, not all of them work - when I entered them they worked, with the passing of a few days surely most of them are no longer online.
You should check from time to time, with specific proxy programs or with O.B. same.
O.B. it has a check inside, it's a bit slow but it works, or use the automatic rotation of the proxies by entering the API url for each of the supported proxy types... in this case it's no longer you who manage them and worry about them working but it is the site itself.
I also remember that many proxies found on the net for some servers are blacklisted or even banned, that's why (one reason but not only) on some servers in the proxy status there are several "Retries".
I use all 3 types of proxies, the best ones are SOCKS5 you don't find many on the net, you find a lot of HTTP/HTTPs.
Greetings.