PPoE Error 651: Modem has reported an error

Hello. I get an Error 651 message with PPPoE links in Windows 7 operating system.
When I want to share my broadband link in windows 7, I find the following Error 651
The whole error looks like:
Connecting through WAN Miniport (PPPOE)…
Error 651: The modem (or other connecting device) has reported an error.
Here's a screenshot of the error.
Any ideas?

Connecting through WAN Miniport (PPPOE)
Error 651: The modem (or other connecting device) has reported an error.
If you continue to receive error messages you can enable logging for analysis.
Enable logging For logging options, see diagnostics.
Logging options can also be accessed by clicking the Remote Access Preferences menu item under the Advanced menu of the Network Connection Folder
