>Hi,
>
>I received an error message from the customer using VFP 9 app with SQL Server 2005. The error message says "[ODBC SQL Server Driver] Communication link failure."
>
>Does anybody know what could cause such error? What to do to prevent it? TIA.

The connection to the SQL Server is lost.
You can't prevent this, but you may try to reconnect.
This could be caused by bad LAN card, torn cable, bad switch etc. No power for some LAN devices.