can't authenticate linux host

Dear All,

I'm trying to add new Centos Linux asset using password authentication, but i get below error

Could not discover SSH host key: Queuing task.
Starting task.
Connecting with asset centos (server ip).
Connecting to asset centos (server ip) failed with error: Connection timeout.
Failed to discover SSH host key for asset centos.
Task completed with failure. (60307)

please help