unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.5: cannot open URL 'http://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'

unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.5:
cannot open URL 'http://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'
hello
trying to install a package I encounter this error
how can I investigate the cause of blocked access ?
I appreciate your help

This seems like a system specific problem, is your internet connection behind a proxy server or a firewall?

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