Website is Persistently Defaced

[AngelicKnight]

Hey guys, been a long time since I posted here, but I need some advice on a problem my friends' are having with their site.

Take a look at www.tfarchive.org and click forums (specifically www.tfarchive.org/forum).

Now depending on how soon you click that link from my posting it, the site may or may not still be defaced, but basically our site keeps getting defaced by "Hacoor" of the "Palestenian Hacker Team" ("Dr.exe & Kaher ELhkr & Al.GhAmEd & The Big Hackerz") claiming mafia-hack.com as their home.

The admin of the site is a pretty sharp guy, and has been working on patching and improving security on the site for the past week. Despite every measure he's tried after identifying each vulnerable back door and closing it, the darn scripties within a day or two have it defaced and down again with their little message page. Within the past week, the site has been attacked five times.

So these guys are very persistent and intent on not letting the site recover and come back up, and thus far every security measure to keep them out has failed.

Now personally, I'm not a web design guy, much less versed in any vb script, so all this is well over my head -- I'm a network guy. But can any of you guys here provide any advice on what more can be done?