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Table of Contents

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  • Close all browser windows and restart your computer.
    • Fragmented RAM (computer memory) can sometimes cause problems.
  • Make sure the browser software being used is the latest version.
    • Version checks are usually found in the browser's "Help" → "About" dialog, accessible from the options menu in the upper right of a browser's taskbar.
  • Try different browsers (e.g. Firefox instead of Chrome, Microsoft Edge, or Safari). 
    • If it is a security issue, a different browser may indicate that there are security risks accessing the website, but give the option to accept the risk and go ahead.
  • Try accessing the site from an "Incognito" or "Private" browser window (usually found in an options menu in the upper right of a browser's taskbar.
    • This can bypass browser cache or cookie issues that can interfere with connections.
  • Clear the browser's Cookie cache

If problems persist, please email our rctf-support@utexas.edu support email, including a description of what error or issue you are experiencing.

EDU pod connection issue

An issue on the EDU pod may arise when students use the edupod.cns.utexas.edu virtual host to access RStudio server. The edupod.cns.utexas.edu virtual host acts as a front end load balancer for the request, and forwards it to one of the back-end compute servers. If this occurs, try accessing individual servers specifically:

If accessing a specific server works when using the virtual host does not, please let us know by emailing our rctf-support@utexas.edu support email.

Zombie processes

A "zombie" RStudio process may be preventing you from successfully logging in to an RStudio session. If your POD has more than one compute server, try logging in to one of the others. If that works, the issue is related to something on the compute server you can't login to.

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Sometimes users will get an "Unexpected response from server" error when attempting to upload a file. Here are some troubleshooting tips:

  • Try the Browser issues troubleshooting tips, especially:
    • Make sure your browser is up to date with the most current version
    • Try the operation in at least 2 different up-to-date browsers (e.g. Chrome and Firefox)
    • Try the operation in a private/incognito/safe browser session
  • Try the upload operation from the JupyterHub web application instead of from RStudio
  • Try connecting to a specific back-end compute server as described at EDU pod connection issue

Disk quota exceeded

Another type of problem can arise when a user's 100 GB Home directory quota has been exceeded (not applicable on the EDU pod, which does not have Home directory quotas). This can produce errors when trying to start RStudio Server or R, perform work in R, or even install additional packages. For example, you may see a "Cannot connect to service" message after logging in to RStudio Server. Or, if an R session has been established and saving a new file would exceed the Home directory quota, users will often (but not always) see an error like the following:

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