when using an access URL without specifying a protocol, (e.g. --access-url=35.xxx.xxx.206), the Coder agent will default to dialing the server over HTTPS, causing the connection to hang:

⢎⡀ Waiting for connection from main ...

the fix here is to simply update the access URL to be --access-url=http://35.xxx.xxx.206. however, to prevent this behavior in the future, the Coder agent should default to HTTP (as curl does), or attempt to dial over both HTTP & HTTPS.