You obviously don't know what a proxy is
I know exactly what a proxy is, I use them, have set them up, have even written a small one, and routinely block them. Perhaps these port examples you're giving aren't true proxies and you're confusing me discussing apples and oranges the claiming I don't know apples because I'm talking about oranges instead.
All I know is there are a lot of sites out there blocking open port 80s and maybe, just maybe, you should address people posting the code that the OP took such as this site:
That's how that stuff propagates all over the place.
Don't shoot the messenger.
Even if you had the login details
What login details?
I've been discussing OPEN PROXIES and there are a bunch!
Secured proxies? Who cares! Why would anyone block those until they get caught doing something bad? Just like you don't block secured email connections with relay disabled until they get caught being used for nefarious purposes like spam.
Real proxy checking code actually attempts to make a complete connection to verify the proxy is open and available for random usage which is not what the OPs code does, but that's what people are passing for proxy checkers these days per the link I provided above and code I've seen in many so-called proxy blocking scripts.
A real proxy testing script would actually attempt to read/write content via the open socket and some target site because the fsockopen() function often returns false positives which can't be confirmed or denied until an actual data transfer attempt is made through the socket.
Now, unless you want to quiz me on proxies and PHP socket code further, assuming we're on the same page of what constitutes an open proxy, which I didn't know was a variable that needed to be expressly explained, let's continue.
When you say those ports are open, you mean they get a valid response to fopensocket(), which also returns false positives, and may be password protected which can only be determined by attempted data transfer, correct?
To that end, the OPs code is wholly inadequate, but the short answer to his simple questions and problem is still to make a simple exception for the IP address of the service he wants.
Solving the rest of the open proxy predicament is way more complicated, and even THAT still needs exceptions to those rules. He needs an open source or commercial program that properly enables proxy blocking and stop playing with simplistic code that causes more problems than it fixes.
[edited by: incrediBILL at 12:47 am (utc) on Mar 20, 2012]