RStudio-Server Unresponsive when run through either Apache or Nginx proxy

I've used both blocks of code provided on the Rstudio website for both Apache and Nginx and get the same thing. Going through the URL, I can log in just fine, but if I try to do anything, I get a "Error: Unable to establish connection with R session" message.

On the other hand, if I go to [server IP]:8787, it works as expected.

I've tried manually disabling each of the options in the Nginx config file provided on the website to no avail.

Any thoughts?