Monitor of JBoss server not returning anything

I am trying to create a monitor for a website. The specific site and all other available sites within the server, JBoss on Tomcat all return the "Empty Reply from Server" when doing a curl. The curl command is "curl -v -A Mozilla/4.0 -H "Host: server.domain.com" -H "Connection: Close" http://ipaddress:8080". I can add other valid URIs at the end of the string with no result however through a browser all works fine. Any thoughts/ideas?