I installed RStudio Server (Open) on a CentOS 6.3 server following the basic instructions, and was able to authenticate using my system user and password without any problems.
However, when I tried the same (even same version of RStudio Server) on a CentOS 7.2 server, I'm unable to authenticate. It just tells me that the username and password aren't recognized. Any suggestions on how to fix this?
Deep in the useful and exhaustive documentation, I found the answer!
On RedHat, CentOS and SUSE systems applications without their own PAM profiles are denied access by default. Therefore to ensure that RStudio is running and available after installation a default PAM profile is installed at /etc/pam.d/rstudio
The default PAM profile doesn't work on CentOS7 though it appears to have on CentOS6.3. To fix this, follow their suggested steps of copying a working PAM profile over to the RStudio one:
sudo cp /etc/pam.d/login /etc/pam.d/rstudio
Hope this helps someone else who stumbles here!