OT: MS Server Question, HELP!, calling on the geeks ... Options

[SirAndy]

sooo, on one (actually 2) of our servers running IIS, we get a lot of hack attempts lately. they're all of the same type, buffer overflow attacks on port 80.

i have all the latest security patches (Windows NT 4) and they are NOT compromising the box, that's the good news.

the bad news is, that lately, the type of attack has slightly changed and now they succeed in crashing IIS!

so here's the problem:
this box (or 2) run important eCommerce websites for me so closing port 80 or moving to another port is NOT an option.
moving to another OS is NOT an option. banning IP's is NOT a option (most of those kids are on dialup DSL, so i would have to block a whole range, most likely cutting out legit customers)
how can i run those websites without having IIS die on me a couple of times a day?

the only thing i can think of is to implement some sort of content filtering that removes malicious code before it gets to the web-server.
anyone here who has a running example of a setup like that?
what (good) firewalls have that sort of filtering and how much do they cost?

i'm at the end of the rope here ... (IMG:style_emoticons/default/fighting19.gif)
Andy

[SirAndy]

I've told ya before Andy, I'm no Windoze 'spert, but ditch IIS. If I'm not mistaken, you can load Apache on NT can't ya? At least that way you have a snowball's chance in hell of getting updates at least for your web server.

can't do that. the site uses ASP. a lot. like over 100,000 lines of code. plus it uses various ActiveX components.

i'm not going to redo all that just to switch ...
(IMG:style_emoticons/default/wink.gif) Andy

PS.: i *think* i got it under control for now. the file permission issues was kind of a PITA, but that is working again.
the urlscan filter seems to be working. fingers crossed ...

thanks guys for all the help! (IMG:style_emoticons/default/pray.gif)