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Office.Interop generates hidden Internet calls

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Office.Interop generates hidden Internet calls [message #782] Mon, 07 August 2006 05:03 Go to next message
Messages: 1
Registered: August 2006
Junior Member

I have noticed that including the Microsoft Word 11.0 Object Library in a
Visual Studio 2005 project (using Visual Basic .NET) generates hidden
Internet communication from the compiled exe-program, if an Internet
connection is accessible.

It is very easy to verify this behavour (Using Windows XP Pro SP2, Office
2003 and Visual Studio 2005):

Open Project, Add Reference, Choose the COM tabpage, double click on
Microsoft Word 11.0 Object Library (version 8.3)

This will add 3 references to the project, which are shown in Project
Properties, References:
Microsoft Office 11.0 Object Library (version
Microsoft Visual Basic for Applications Extensibility 5.3 (version
Microsoft Word 11.0 Object Library (version

This is the only code written by me:
Imports Microsoft.Office.Interop
Public Class Form1
Dim wdApp As New Word.Application
End Class

When I compile and execute the program, the firewall Zonealarm informs me
(if the Internet connection is up and running), that the program is trying to
connect to the Internet to a DNS. If the program can't get a response, it
will wait for approximately 15 seconds before it continues to run the code
and present Form1 on the screen. If the network cable is disconnected, no
delay can be observed.

I would like to know:
1. What kind of data are transmitted?
2. How can this communication be turned off?
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