With soapui pro seat license,when we install license error connection refused to host: How to fix??

Do you have smartbear assigned that ip to the license 

Contact support to figure out how to get that done

https://support.smartbear.com/

If you can provide information from the logs, that may be helpful as well. These can usually be found in a folder in your user directory.

With an example from windows:

C:\Users\USERNAME\.readyapi\logs