The CA Process Automation orchestrator service starts without any error message, but the login page for CA Process Automation will not display. Instead there is a generic cannot connect to page web page error message displayed.
In the c2o.log file located under $ITPAM_HOME/server/c2o/log there is an error message showing:
no inet4address associated with interface
You must disable IPV6 in your network connections.
For Windows 2008 this is found under Control Panel//Network and Internet//Network and Sharing Center//Change adapter settings.
Right click on the connection and select properties.
Uncheck Internet Protocol Version 6
<Please see attached file for image>
Click OK and try the web address again.
IPv6 can also be disabled on a Win2008 server via the command line which adds a registry value and then requires a reboot of the server. This should be discussed with your network admin before performing this.
There is also a Microsoft KB article on how to disable this here:
Release: ITPASA99000-3.1-Process Automation-Add On License for-CA Server Automation