Conexant Winmodem session "dead" after login
I have a problem with a Conexant PCI Winmodem. Everything seems OK when starting the session with Kppp; the modem makes the call setup, it logs in to my ISP and I get IP addresses back but neither Internet nor e-mail works. No bytes seem to be sent or received according to the status log in Kppp (besides from very few at the starting sequence) though the session clock is running.
Has anyone a clue that can help me? I have tested different settings in Kppp but nothing seems to do the trick.
Linux distribution: Mandrake 9.2 with kernel 2.4.22, modem type: hcf, modem driver downloaded from Conexant.