R: InternetOpenUrl failed: ‘The date in the certificate is invalid or has expired’

March 10, 2016
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Today the two-year-old TLS security certificate for cran.r-project.org expired, so suddenly in R you are getting errors running install.packages or update.packages.

The error looks like this:


> update.packages()
--- 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 date in the certificate is invalid or has expired'

The workaround is simple: choose another repository! For example:

Read more »

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