T3-1 about netmanagement port

  I am using Oracle SPARC T3-1 net management  port to redirect the console. Who can support help on this?When I login from Netmanagement portal, generally, I can use kvm but it doesn't work now. also there is no any error message .
Just shows like as below

Launch Redirection

Manage the host remotely by redirecting the system console to your local machine. Launch the Oracle® Integrated Lights Out Manager Remote Console to utilize the RKVMS features. Select serial redirection to access the host's serial console.