This has been posted by others on the Q&A hub but hasn’t got an answer. Running it by the community to see if anyone has had a similar issue and solved it.
Basically Swarm is running into some king of certificate verification failure it looks like (see the logs in the link below). The end result is I can’t build.
This has nothing to do with anti-virus and firewalls. Believe me, I went so far as to uninstall them all.