R proxy configuration in window

[linq]

Edit the shortcut on the desktop

"path_to_R\bin\i386\Rgui.exe" http_proxy=http://user:pass@gannet:
80/

"path_to_R\bin\i386\Rgui.exe" http_proxy=http://gannet/
http_proxy_user=ask

The second version will prompt the user for the proxy username and
password when HTTP downloads are first used.

Another possibility is that firewall settings are blocking the R
executables from contacting the Internet, but this should result in
informative error messages from the firewall program.

see the detail “http://cran.r-project.org/bin/windows/rw-FAQ.html”