Have you tried connecting to localhost just using http: // localhost: 3000 ? If your backend and Meteor frontend are running on the local host, you should not try to connect via https or wss. Your computer does not have a trusted certificate, so the connection cannot be made.
Also, do not use force-ssl locally for the same reason that I mentioned above.
Please post the full error in Safari if the above solution does not work. Please check what works where (they are both on the local host or only on one).
Joshjo
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