Error writing CA certificate: connection reset by peer

[ariefrizkyr]

When I tried to add cluster with this command:
flynn cluster add -p {{CODE}}= default domain.com {{CODE}}

I got this error output:
Error writing CA certificate: Get https://controller.domain.com/ca-cert: read tcp 10.11.80.36:51121->13.229.239.188:443: read: connection reset by peer

Is there any solution for the issue? I will be very happy to provide additional information if needed. Thank you!