Although I have installed R many times on many machines without problems, 
I have recently encountered a problem with accessing packages.  R has been 
installed successfully with the "--internet2" option. The session info is 
below. 
> sessionInfo()
R version 2.8.1 (2008-12-22) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United 
States.1252;LC_MONETARY=English_United 
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base 
loaded via a namespace (and not attached):
[1] tools_2.8.1
> 

When I try to load a package ("chron" in this example) from the CMU 
mirror, I get the following error message:

> utils:::menuInstallPkgs()
--- Please select a CRAN mirror for use in this session ---
trying URL 
'http://lib.stat.cmu.edu/R/CRAN/bin/windows/contrib/2.8/chron_2.3-28.zip'
Error in download.file(url, destfile, method, mode = "wb", ...) : 
  cannot open URL 
'http://lib.stat.cmu.edu/R/CRAN/bin/windows/contrib/2.8/chron_2.3-28.zip'
In addition: Warning message:
In download.file(url, destfile, method, mode = "wb", ...) :
  cannot open: HTTP status was '403 Forbidden (Blocked by NG)'
Warning in download.packages(p0, destdir = tmpd, available = available,  :
  download of package 'chron' failed


This error applies to ANY package. The option --internet2 must be used. If 
not, then I cannot even access the mirror. Can anyone help me out?  Could 
this be a firewall problem?
Joe
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