Forum: Vue


Subject: Vue problem

JoeBlack opened this issue on Jul 31, 2003 ยท 27 posts


MightyPete posted Sun, 03 August 2003 at 4:46 PM

Ports 101 a very brief discription why there are important and what you don't know can hurt you. It might not be perfect but you should get the idea. Every computer connected to the web has a IP address or there is no way of knowing where to send the data. The personal phone number so to speak of every machine. It can change depending on your connection type. Say it's 63.05.20.200 That's easy now where in the puter to send the data. The web html uses port 80 and it's sent like this. 63.05.20.200:80 Easy ay? Now just think every single computer has 65535 ports from port 1 all the way up to port 65535. Easy? Now FTP generally connects port 21 and there is tons of others but remember you can connect port 21 ftp then go to port 3600 to tranfer files if that's the way the guy sets up his ftp server. See a problem? Say I ping your puter port 1428 by using the command ping 63.05.20.200:1428 Your puter returns the ping. Hey a live one ready for harvesting. It's that easy to hack into somebodys puter. That's a easy as it gets and that's why kids seem to do it with no knowledge what so ever. Hmmm I coud now send a small program to your now open port that I know about that could ping endlessly some victim on the web say redmond. If I get enough of these open ports around the web I could kick redmond off the web actually. It would be so busy returning pings that the computer will die under the load. Open ports, Good, bad? Well you need them open to serf the web for one the trick is to only open them when you need them and only connect to puters that you want to reguardless of all the traffic trying to connect or find open ports on your connection. You'd think something as important as this would be closed by default but are not. A firewall does that. It does not close ports it plays dead. Somebody pings you on some open port and the firewall simply does not return the ping. Is there a computer there or not? With a good firewall it's impossible to tell. You can right a small script ping'em all start port 1 and go to 65535 and if live report ip to 63.05.20.200:21 If none found add 1 to ip and search again idea. If you have a firewall you'll see this kind of activity all the time on your logs. So you need a firewall. The XP firewall excuse does not close all open ports. Why? Good question. Redmond has a back door into your puter. port 1428 was a port redmond left open and was used to try to kill the web DNS lookup with billions and billions of requests. Found Open 1428 ports where instructed to ask for dns lookup information in a endless loop and find more open 1428 ports ont the web. In about 6 hours the web almost crashed under the load. See that link I sent you down at the bottom about leak test. It's on the web and test some of the more common open ports and a program there can test all of them for you all 65535 of em. Now why would microsoft leave open ports? That 1428 almost crashed the entire web. There idiots actually. They're brain dead to leave them open. That port left open was for internal messages trew MSN I believe. Admin messages. Well you leave it open, you take your chances. You can leave it open but a firewall should block attempts to try to connect to it. Microstiffs sive of a firewall does not but in all fairness thy have plugged that hole. only 65534 to go. Get the idea now? Oh and I did say you can change the port on the fly. send to port 80 but then change to port 4000 ICQ's connect port. If you don't run a firewall well it's no wonder your puter is so slow. You have millions of people using it along with you. The way in. Send spam email and when there open a closed port and start spamming the web. Get the idea? Your rendering away and your puter is starting WWW4. Best to play dead on the web and run a real firewall like ZoneAlarm. At least if you recieve such a e-mail message you'll know the second that port is opened who opened it and if you want to prevent that program from doing so. The harm is from the inside. It's not the big bad web it's stuff on your computer doing things without your knowledge or consent that's bad. They arrive in e-mail or in programs you download and buy like XP. Without a firewall your a sitting duck with 65535 ports ready to be exploited. Now it's not that bad if your on dial up but it's almost the same. Your IP changes every time you connect do it's harder to get a fix on it. But you can always just e-mail em. These puters are not a good choice though high speed always on connections are what there looking for. Hmmm Look how fast you could render with a few million puters doing the work!