Hybrid.cloud.tyk.io:9090... is this SSL?

Is this a SSL connection? hybrid.cloud.tyk.io:9090

No 9091 is SSL connection

so just alter the port here to 9091 and it will negotiate ssl ok? no https qualifier?

"connection_string": "hybrid.cloud.tyk.io:9090",

It’s not HTTP, so no transport is needed, you do need to set slave_options.use_ssl: true