nokogiri offline?

trying to install nokogiri for the last six hours or so, fresh rails 5.2 install, but 1.3.3 (so latest gem), and it's not working.
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)

bad response Forbidden 403 (https://api.rubygems.org/quick/Marshal.4.8/nokogiri-1.13.3-x64-unknown.gemspec.rz)

Anyone else seeing this? The site itself is alive.