Cisco VPN problems

I'm having trouble with with VPN (Cisco IPSec) connection. I could use it before very well. But for last two days I started having problems with it and last night I could only connect it sometimes after trying out several times. In last two days I only remember installing Tunnelblick to access another OpenVPN connection (which didn't work anyway) and changing the password of the login keychain. I uninstalled Tunnelblick today and after reading here I changed in the keychain for Cisco VPN the option to be used by all applications. But I'm still not able to connect the VPN connection. I have another PPTP VPN connection, which is working fine. Can anyone suggest what could be the problem here and how can I fix it?