Microsoft OLE DB Provider for ODBC Drivers error '80004005'


I am moving a classic asp website to a new hosting provider. The code has been running for six years so problems should be down to the new environment.
This is the code. The *** is the line identified as in error

'* Transaction START
DIM connCart
SET connCart = Server.CreateObject("ADODB.Connection") conn
IF connCart.Properties("Transaction DDL") = 8 THEN connCart.BeginTrans   ****

The error message
Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
/shop/CartCode.asp, line 138

What could be wrong please?

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Seems like you haven't specified a connection string for your database connection.

Check the connection string for your database:

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