Thanks to Greg and Michael for their advice.
I have tried all these possibilities (and other); nothing seems to work; I persistently get the message:
In open.connection(con, "r") :
  cannot open: HTTP status was '407 Proxy Authentication Required'
It seems as if "proxy authentication required" is causing the problem.
It seems I have to set up an .Renviron file, but I am still learning R, and cannot find such a file.
Would it help, and how do I create it (it that is a possible alternative to try).
Thanks for any comments.
Jacob


Jacob L van Wyk
Department of Statistics
University of Johannesburg (APK)
PO Box 524, Auckland Park, 2006
Office ph: 011 559 3080
Fax: 011 559 2499


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