Comment 1 for bug 289239

after adding the user to the group dip I could connect, but could not stay connected; it disconnected after a few seconds.
here is the output of the connection log:

-> Ignoring malformed input line: ";Do NOT edit this file by hand!"
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATM1L3DT019352471
--> Waiting for carrier.
ATM1L3DT019352471
CONNECT 38400
--> Carrier detected. Waiting for prompt.
~[7f]}#@!}!}!} }=}!}$}%\}"}&} }*} } }#}%B#}%}%}&}>t}%4}'}"}(}"t[07]~
--> PPP negotiation detected.
--> Starting pppd at Mon Oct 27 20:15:04 2008
--> Warning: Could not modify /etc/ppp/pap-secrets: Permission denied
--> --> PAP (Password Authentication Protocol) may be flaky.
--> Warning: Could not modify /etc/ppp/chap-secrets: Permission denied
--> --> CHAP (Challenge Handshake) may be flaky.
--> Pid of pppd: 12857
--> Using interface ppp0
--> Disconnecting at Mon Oct 27 20:15:31 2008
--> The PPP daemon has died: A modem hung up the phone (exit code = 16)
--> man pppd explains pppd error codes in more detail.
--> Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.

there is no valuable info in /var/log/messages:

Oct 27 20:15:04 cy810 pppd[12857]: pppd 2.4.4 started by ullix, uid 1000
Oct 27 20:15:04 cy810 pppd[12857]: Using interface ppp0
Oct 27 20:15:04 cy810 pppd[12857]: Connect: ppp0 <--> /dev/ttyACM0
Oct 27 20:15:30 cy810 pppd[12857]: Modem hangup
Oct 27 20:15:30 cy810 pppd[12857]: Connection terminated.
Oct 27 20:15:30 cy810 pppd[12857]: Exit.

lsusb is giving this on the USB modem: Bus 004 Device 004: ID 0803:3095 Zoom Telephonics, Inc.