The only thing I would say is to make sure your URL for Designer is https://your.domain.com:443 to make sure you specify both HTTPS and port 443. Then under Network -> Webserver, make sure the public address also shows the same your.domain.com domain name (this usually works without this, but this will force it to use your domain name. Also, if you have a corporate VPN, turn it off to make sure you're not fighting it with DNS records as a precaution.
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