Working dial-up connection - No Client Connection

[vigol]

Hi
One guy had a great time to crack my poor system, by removing/Changing some of configurations files & permissions.
All things recovered & system's goning up, with the exception of :

* I could connect to Internet with a dial-up connection with KPPP (I used to it!).
* All Modem Status Lights are fine (OH, CS, TR, CD).
1- But No Client (All Browsers, Messengers, ...) can access/make connection to Internet, at all. -- Exactly same as when it's disconnected.
2- No sign in RD(receive) & SD(send) status light.
* OS: FreeBSD 7.0-Release-i386 (Installed from Default ISO).

frankly, There's no idea that what's the problem & where's the start point.

thanks for your reply, in advanced!
Bye