Event Type: Error
Event Source: Microsoft Firewall
Event Category: Log
Event ID: 7
User:  N/A

Description:
The Microsoft Firewall was unable to open ADO connection. The MSDE Error description is: Invalid connection string attribute, [DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error..

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 05 40 00 80               .@.€   

Cause:

A SSL certificate was installed, and MSDE is attempting to use it.  As a result, the Microsoft Firewall Service is unable to connect to MSDE.  Remove the certificates and reboot the machine.

• http://www.dbforums.com/showthread.php?t=1192105
• http://support.microsoft.com/?id=309398