I have a customer reporting a problem connecting to the internet and the problem could be related to him being under a proxy server. I don't have a proxy server to test with. So, I am checking to see if using a free proxy service would be ok for testing. I did an internet search on free proxy servers and came up with a bunch of results. I don't want to randomly choose one so I am asking the experts for three different choices for some good free proxy services to use for my testing.
Thanks in advance,