Let me give you the background of this first, so you have a better idea of what is going on:
-I run a parachat on my website, and I get a lot of users on it. There is a very small minority of users, not more than 5 maybe, who come randomly and cause havoc. Now these users get banned of course, but somehow, they come back, using different IPs. The system bans users based on their IPs only.
At first, I thought they were using these freely availably IPs from different websites. So I was trying to outsmart these guys by getting their IPs, putting it in Google, and getting to the page where they got that IP from, and going one extra step, by banning every available proxy IP I found on that page. As a result of doing this, I have now banned over 1000 public proxy IPs, and this has helped a bit.
But lately at least one or two of these users, have been using IPs which I haven't been able to find anywhere. I am not sure what they are using. One of them told me that they would tell me the secret soon.
I caught another one of them saying the following, which I have been trying to understand the maning of it:
"the webmaster can write a simple script so that his port 8080 does not reallow each single ISP"
Could this be the missing clue? could this be the hole from which these people are entering?
Any help would be greatly appreciated. I mean these guys must be stopped, and can't just keep on using unlimited IPs forever.
Please give me any clues you can come up with on how I can safeguard my chat against them. Is there any script I can implement on my chat or on the page on which the chat exists?is there a way to block a certain port as the person above mentioned?