It appears the CloudStack UI issues i (and others have been experiencing) relate to outdated tomcat version we are using.
Please reference CLOUDSTACK-7907 Tomcat issue https://issues.apache.org/bugzilla/show_bug.cgi?id=54947 Bug 54947 - Http11NioProtocol generates HTTP 505 responses on valid requests if request is split across multiple packets Surprisingly enough, redhat 6 and its latest at the moment tomcat 6.0.24.62 does not have the fix backported. http://rpm.pbone.net/index.php3/stat/22/idpl/25442959/com/changelog.html If i was to use non redhat tomcat, could i use apache tomcat 6.0.38? Thanks ilya