Q:

RStudio Proxy Configuration on Windows

This question has been asked in: Configure proxy on Rstudio. However, it was never resolved.
I am a user of RStudio 0.99.486 version and R 3.2.2 version. I have tried 2 ways to configure proxy settings in the office without success after reading several suggestions:
FIRST TRY: 
Type in Rstudio as first line:
    Sys.setenv(http_proxy="http://user_name:password@proxy.company_domain.es:8080/")
Go to: 
-Tools, -Global Options, -Packages, and unmark option: 

"Use internet library/proxy for HTTP"

I also unmarked the option: "Use secure download method for HTTP".
Besides, I right-clicked on the R x64 3.2.2 icon of the desktop and added after 1 space in the "Target" camp: 
http_proxy=http://user_name:password@proxy.company_domain.es:8080/
It did not work as I received the message: 

Warning in install.packages :   cannot open: HTTP status was '407
  Proxy Authentication Required'

SECOND TRY:
Create a notepad file with the name: 

.Renviron

Saved it in: "C:\Users\username\Documents". 
The file contains inside the following 2 lines: 
http_proxy=http://proxy.company_domain.es/
http_proxy_user=user_name:password

When I try installing a package I receive: 

"Warning in install.packages :   unable to connect to
  'cran.rstudio.com' on port 80. 
  Unable to access index for repository http://cran.rstudio.com/src/contrib"

After running code line: R.home() My R_HOME route is: 

"C:/Program Files/R/R-32~1.2"

I appreciate before-hand for your advice and help.

A:

Thank you for your question. It helped me to resolve my issue. I had to unmark the option to use the settings from the Internet Explorer and restart. 
Maybe your .Renviron does not contain the proxy port, you have to write
http_proxy=http://proxy.company_domain.es:8080/
http_proxy_user=user_name:password

If you specify 
http_proxy_user=ask

it should prompt you for user name and password - then you know that the file is read

