check_http Not fully working

I have a website that I am trying to monitor on a server but the website has a security exception that has to be dealt with in order to get to the actual web page. Right now my command is :
check_http!-H websense -p 9443 -C 0 -a

I am getting the notification that the server is flapping.

Status is: Usage: check_http -H

Not really sure what I need to do here.

It’s running on latest version of Ubuntu server

Thanks for the help.

i suspect you need a FQDN instead of the servername (websense).