title: R - cannot access urls for package installation
body: <p>I recently installed R Studio (Version 0.99.892) on a personal computer (windows 8) and am trying to install, among others, the following packages:
  ggplot2; 
  dplyr; 
  rmarkdown; 
  tidyr.</p>
  
  <p>Neither R nor R Studio is able to install any of these packages.  Each time I attempt to install a package, I get the set of warnings I include at the bottom of this post.</p>
  
  <p>I have used the install.packages command as well as the built-in package installation tool.  I have tried several different mirrors.  </p>
  
  <p>I have tried a public university internet source, my own private internet source, and a phone tether.  I have tried to connect through a VPN.  I have added R Studio to my Windows Firewall exception list and have also completely disabled the Windows Firewall.  I am running no other firewalls.</p>
  
  <p>I have toggled the various connection options in the "Packages" tab in Global Options.</p>
  
  <p>I can access the URLs in a browser.</p>
  
  <p>Here are the warnings from R Studio:</p>
  
  <pre><code>&gt; install.packages("devtools")
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    unable to access index for repository https://cran.fhcrc.org/src/contrib:
    cannot open URL 'https://cran.fhcrc.org/src/contrib/PACKAGES'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be     resolved'
  Warning in install.packages :
    unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
    cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
  Installing package into ‘C:/Users/Nikhailovich/Documents/R/win-library/3.2’
  (as ‘lib’ is unspecified)
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    unable to access index for repository https://cran.fhcrc.org/src/contrib:
    cannot open URL 'https://cran.fhcrc.org/src/contrib/PACKAGES'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
    cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
  Warning in install.packages :
    package ‘devtools’ is not available (for R version 3.2.3)
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    unable to access index for repository https://cran.fhcrc.org/bin/windows/contrib/3.2:
    cannot open URL 'https://cran.fhcrc.org/bin/windows/contrib/3.2/PACKAGES'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning in install.packages :
    unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2:
    cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2/PACKAGES'
  </code></pre>
  
  <p>Here are the warnings from R (3.2.3):</p>
  
  <pre><code>&gt; install.packages("ggplot2")
  Installing package into ‘C:/Users/Nikhailovich/Documents/R/win-library/3.2’
  (as ‘lib’ is unspecified)
  --- Please select a CRAN mirror for use in this session ---
  Error in download.file(url, destfile = f, quiet = TRUE) : 
    cannot open URL 'https://cran.r-project.org/CRAN_mirrors.csv'
  In addition: Warning message:
  In download.file(url, destfile = f, quiet = TRUE) :
    InternetOpenUrl failed: 'The server name or address could not be resolved'
  Warning: unable to access index for repository https://dirichlet.mat.puc.cl/src/contrib:
    cannot open URL 'https://dirichlet.mat.puc.cl/src/contrib/PACKAGES'
  Warning: unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/src/contrib:
    cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/src/contrib/PACKAGES'
  Warning: unable to access index for repository https://dirichlet.mat.puc.cl/bin/windows/contrib/3.2:
    cannot open URL 'https://dirichlet.mat.puc.cl/bin/windows/contrib/3.2/PACKAGES'
  Warning: unable to access index for repository http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2:
    cannot open URL 'http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/3.2/PACKAGES'
  Warning message:
  package ‘ggplot2’ is not available (for R version 3.2.3) 
  </code></pre>
  
  <p>There are several stackexchange posts on package installation in R and R Studio, but I was not able to find any that answered my particular situation.  Thanks in advance to anyone that knows what's going on</p>