Thanks @cole and @Blair09M. I thought I had it configured to use http://localhost:5000/rsconnect/, as you suggested, but apparently not. When I updated the URL accordingly, it worked.
In conclusion, the steps below are necessary to connect RStudio IDE Server to RStudio Package Manager (PM) and to RStudio Connect.
How to connect IDE Server to Package Manager and to Connect in QuickStart:
- Add PM to IDE:
In the menu at the top of IDE, navigate to Tools -> Global Options -> Packages -> Connect -> RStudio Connect, and replace Primary
CRAN repository with the QuickStart PM URL http://localhost:5000/packages/cran/latest/. Then, allow IDE to connect to the non-HTTPS URL that PM is hosted on within QuickStart by unchecking the "Use secure download method for HTTP" box.
- Add Connect to IDE:
In the menu at the top of IDE, navigate to Tools -> Global Options -> Publishing, paste the QuickStart Connect URL http://localhost:5000/rsconnect into the box, and click Next. Then, follow the steps as that it takes you through.
Given that the purpose of QuickStart is to evaluate how these three tools work together, though, couldn't these steps be shown right on the Getting Started page, rather than at the bottom of the Product Tour page? Reviewing the Product Tour page might not seem necessary to developers who just want to get started with QuickStart because they have already been hearing about the trio. Also, couldn't the QuickStart VirtualBox image itself also just ship with these configurations already made as defaults, so that developers can get up and running even faster?
-- Regis --