Re: [Rd] Cross-platform check for internet connection

From: Prof Brian Ripley <>
Date: Fri, 22 Jun 2007 12:40:38 +0100 (BST)

On Fri, 22 Jun 2007, hadley wickham wrote:

> What's the recommended way to check if an internet connection is
> available across platforms? I was using is.null(nsl()) but this does
> not work on windows.

I don't know a way to do this on Windows without a possible very long hang. It's complicated by the use of two alternative internet connection mechanisms on Windows and having little control over the IE-based one.

Another issue is software firewalls: they can take many minutes to decide to let a new program talk to the Internet if they 'call home' to ask advice.

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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