There can be many reasons for the problem. I am stating some scenarios.
If the problem persists then feel free to post the query.
If the connection is not established even once,
then try for the following :
1. In this case, windows (inbuilt, or 3rd pary ) firewall might be causing the issue. Solution is simple-- add that VPN client program or port number to the exceptions list of the firewall. Depending upon your configuration, port numbers can be for ESP, AH, isakmp etc.
2. If you are using NAT/PATin the configuration, check for the PROPER nat translations.
If the connection is terminated after connecting atleast once
Then It seems that something is changing your routing table after you connect. This is considered the sign of a trojan or backdoor. So, the VPN client is configured to detect this change and immediately shut the client down so that the remote network is not compromised by someone unauthorized. You will need to open a command prompt and do a 'route print' before you try the VPN client. Save that output to a text file. Then try the VPN client. Do a 'route print' right after you try to connect and see what is different. Then when you get the disconnect, do 'route print' again. Hopefully you can isolate what route is coming and going that is breaking the VPN client.
Another TRICKY issue is, When the computer goes into “Sleep” mode,
Your VPN connection is terminated. You must reconnect and re-enter your NetID and password.
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