Rstudio will not launch: "This site can't be reached refused to connect"

Error Information:

This site can’t be reached refused to connect.


  • Checking the connection
  • Checking the proxy and the firewall

Description of issue -
For a while I was able to launch Rstudio successfully however, spontaneously threw this error
Attempted steps taken to fix -
Reinstalled Rstudio
Updated R to v3.6 (the latest version)
Removed Rstudio caches
Reset Rstudio desktop state

System Information:

  • RStudio Edition: (Desktop or Server): 1 .2.5019
  • RStudio Version:
  • OS Version: Mojave 10.14.6
  • R Version: R version 3.6
  • Output your diagnostics report (if possible):
    Using R script: /Library/Frameworks/R.framework/Versions/3.6/Resources/bin/R

Attempting to launch R session...

R session launched, attempting to connect on port 44897...
dyld: Symbol not found: _GEkillDevice
Referenced from: /Applications/
Expected in: flat namespace
in /Applications/

Connected to R session, attempting to initialize...

From RStudio Desktop Will Not Start on

Are you using RStudion embedded inside Anaconda?

I did not intend to run Rstudio through anaconda, but perhaps it decided to do that with the latest update or something.

See also:

This issue should be fixed in the latest release of RStudio, but evidently it is not in your case. Can you try the following:

export DYLD_INSERT_LIBRARIES=/Library/Frameworks/R.framework/Resources/lib/libR.dylib

and see if you have any better luck?

I'm also curious whether having anaconda3 on the PATH is causing issues for you. What is the output of:

which R

on your system?

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