Hi, could you please someone help me to resolve the issue that's occurring when I try to connect to VPN using PPTP protocol on Ubuntu 10.04?
I have set all the parameters (gateway, username, password) correctly as obtained by my network admin but when applying to connect to VPN the connection failed.
I've checked for logs using: grep ppp /var/log/messages and found the following:

Apr 3 18:49:17 ubuntu pppd[4980]: pppd 2.4.5 started by root, uid 0
Apr 3 18:49:17 ubuntu pppd[4980]: Using interface ppp0
Apr 3 18:49:17 ubuntu pppd[4980]: Connect: ppp0 <--> /dev/pts/1
Apr 3 18:49:48 ubuntu pppd[4980]: LCP: timeout sending Config-Requests
Apr 3 18:49:48 ubuntu pppd[4980]: Connection terminated.
Apr 3 18:49:48 ubuntu pppd[4980]: Modem hangup
Apr 3 18:49:48 ubuntu pppd[4980]: Exit.
Apr 6 20:44:34 ubuntu pppd[8584]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded.
Apr 6 20:44:34 ubuntu pppd[8584]: pppd 2.4.5 started by root, uid 0
Apr 6 20:44:34 ubuntu pppd[8584]: Using interface ppp0
Apr 6 20:44:34 ubuntu pppd[8584]: Connect: ppp0 <--> /dev/pts/1
Apr 6 20:45:05 ubuntu pppd[8584]: LCP: timeout sending Config-Requests
Apr 6 20:45:05 ubuntu pppd[8584]: Connection terminated.
Apr 6 20:45:05 ubuntu pppd[8584]: Modem hangup
Apr 6 20:45:05 ubuntu pppd[8584]: Exit.
Apr 7 11:40:50 ubuntu pppd[2032]: Plugin /usr/lib/pppd/2.4.5//nm-pptp-pppd-plugin.so loaded.
Apr 7 11:40:50 ubuntu pppd[2032]: pppd 2.4.5 started by root, uid 0
Apr 7 11:40:50 ubuntu pppd[2032]: Using interface ppp0
Apr 7 11:40:50 ubuntu pppd[2032]: Connect: ppp0 <--> /dev/pts/1
Apr 7 11:41:21 ubuntu pppd[2032]: LCP: timeout sending Config-Requests
Apr 7 11:41:21 ubuntu pppd[2032]: Connection terminated.
Apr 7 11:41:21 ubuntu pppd[2032]: Modem hangup
Apr 7 11:41:21 ubuntu pppd[2032]: Exit.

Is there something more that I have to set? Because connecting to the same VPN in Windows proceeds without any problem.
Thank you