Microsoft OLE DB Provider for SQL Server error ‘80004005’

If it is an Express instance, it is most likely not a default instance, but rather a named instance. So you probably meant:

... "Provider=SQLNCLI10;Server=.\SQLEXPRESS; ...
--- instead of just (local) ---^^^^^^^^^^^^

Otherwise you’ll need to show us the server properties in SQL Server Configuration Manager on that machine in order for us to be able to tell you how to correct your connection string.

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