# Cannot Connect to R

RStudio can't establish a connection to R. This usually indicates one of the following:

- The R session is taking an unusually long time to start, perhaps because of slow operations in startup scripts or slow network drive access.
- RStudio is unable to communicate with R over a local network port, possibly because of firewall restrictions or anti-virus software.

Please try the following:

- If you've customized R session creation by creating an R profile (e.g. located at `~/.Rprofile`), consider temporarily removing it.
- If you are using a firewall or antivirus software which guards access to local network ports, add an exclusion for the RStudio and rsession executables.
- Run RGui, R.app, or R in a terminal to ensure that R itself starts up correctly.

Further troubleshooting help can be found on our website:

Troubleshooting RStudio Startup

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