I think you are running into some weirdness of the CommandTimeout property, as described in msdn.

The CommandTimeout setting on a Connection object has no effect on the CommandTimeout setting on a Command object on the same Connection; that is, the Command object's CommandTimeout property does not inherit the value of the Connection object's CommandTimeout value.

I suggest you create a command object, assign the Connecttimeout to the command, then execute the SQL from there.
See this VBA discussion of the failure of CommandTiemout.

        This is not an optical illusion, it just looks like one.

In reply to Re^4: Setting CommandTimeout by NetWallah
in thread Setting CommandTimeout by amitvalia

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