How I solve this two issues in the following: 1.remote error: tls: unknown certificate and 2. http: TLS handshake error from 192.**: local error: tls: bad record MAC

Hi Dulal! Have you checked https://fleetdm.com/docs/deploying/faq#common-problems Also, let us know a little about your setup, am guessing fleet running with a certificate that's not valid publicly (not signed by known root CA)?