verify VPN connection

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How can I verify whether or not a VPN connection has been made?

I found a registry key showing the network name, but I'm not sure where I can check whether or not its connected.

C++

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\HomeGroup\NetworkLocations\Work

I want to check whether it's connected, so that I get an error message back much faster if there is no connection rather than waiting for a timeout.

Posted 29-Apr-11 9:45am

T2102

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Tarakeshwar Reddy · Answer 1 · 2011-04-29T10:27:00

Solution 1

You should be able to ping the network and see if the connection is established or not. Google search returns many results, one of them was this[^] and you can take a look at the .net RAS at http://dotras.codeplex.com/[^].

Posted 29-Apr-11 10:27am

Tarakeshwar Reddy

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T2102 29-Apr-11 17:38pm

Pinging is the same problem; there is a timeout involved. I run a spreadsheet that might have zero database calls to a remote server or could have hundreds. Checking this with a registry key or something similar is ideal since the timeout delay can be huge.

Hans Dietrich · Answer 2 · 2011-04-29T13:36:00

Solution 2

I think this all comes down to being able to access the remote server, so a timeout is unavoidable. Maybe you can try to access the server in a separate thread, so that it's not so noticeable?

Posted 29-Apr-11 13:36pm

Hans Dietrich

Updated 29-Apr-11 13:54pm

v2

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T2102 9-May-11 11:22am

To know if the call is successful, I can use
<pre>return !system("ping network_DB");</pre>

However, this shows a dialog. I know how to use ShellExecuteEx and ShellExecute to execute the code above with a dialog hidden, but I am not sure how to check whether an error was encountered.

Do you know how I can do this without outputting the results to a file.