There are tons of online proxy testers but a lot of them can’t test the proxies if they have user and pass authentication.
One of the proxy tester which can test proxies with user and pass is TestMyProxies.com
Cool features of TestMyProxies.com are:
- you can be configured on which URL you want to test and you set the timeout
- you can export the good/bad proxies
- it will display the country for each proxy
- will display the HTTP codes for each bad proxy so you can make a better why the proxy is dead