Microsoft OLE DB Provider for ODBC Drivers error '80004005'

I have a problem with this bit of code

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SET conn = Server.CreateObject("ADODB.Connection")
conn.open Application("dbConnect"),Application("dbUSER"),Application("dbPW")  ******

'* Transaction START
DIM connCart
SET connCart = Server.CreateObject("ADODB.Connection")
connCart.open conn
IF connCart.Properties("Transaction DDL") = 8 THEN connCart.BeginTrans
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I have moved the classic asp website to new hosting. Much of it seems to run without problems  but the above code fails with
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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 128
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Line 128 is the line above highlighted  with *****

I would appreciate some guidance on how to correct this.
Note: the code worked in the past with two other hosting companies.
I have now moved it to a new hosting company and this error has appeared.

thanks

Michael