error code 720 in windows 7 : connecting to remote computer

When i try to connect my computer to internet after having power cut i used to see an error message as
"error 720 : A Connection to the remote computer could not be established.You might need to change the network settings for this connection."

Then i connected different network connections alternatively,but no one connection let me to access internet.I was frustrated with such error message.
But when i restarted my system i can able to connect the broadband connection.But i still dont know why such an error occured.The proof for the error message is as follow