Easy Admin Install addons connection error

I am getting an error when trying to use the Easy Admin (3.4.33) module in the Install addons tab. The error is:

Unable to fetch the url https://omeka.org/add-ons/json/s_module.json
Unable to fetch the url https://omeka.org/add-ons/json/s_theme.json
Unable to fetch the url https://raw.githubusercontent.com/Daniel-KM/UpgradeToOmekaS/master_data/omeka_s_modules.csv
Unable to fetch the url https://raw.githubusercontent.com/Daniel-KM/UpgradeToOmekaS/master/_data/omeka_s_themes.csv
No addon to list: check your connection

I can get to each of those urls in a browser or with curl in a terminal, so I’m not sure why this is happening. Has anyone else seen this error?

This is a new installation of Omeka S 4.1.1.