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Problem with BiocManager connection to Internet under Windows: problem solved #186

@lokapal

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@lokapal

For all, whom it may concern - I found the solution what to do, if your R is writing something like:

> BiocManager::install(version="3.14")
Error: Bioconductor version cannot be validated; no internet connection?
In addition: Warning messages:
1: In file(con, "r") :
  InternetOpenUrl failed: 'A connection with the server could not be established'
2: In file(con, "r") :
  InternetOpenUrl failed: 'A connection with the server could not be established'

or (to check Internet connectivity):

> config <- "https://bioconductor.org/config.yaml"
>  readLines(config)
Error in file(con, "r") : cannot open the connection
In addition: Warning message:
In file(con, "r") :
  InternetOpenUrl failed: 'A connection with the server could not be established'

whereas install.packages working correctly. The solution is:

  1. Put to your .Renviron string
CURL_SSL_BACKEND=openssl
  1. Put to your .Rprofile string
options(download.file.method="libcurl", url.method="libcurl")

and restart R.
All should be working now!

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