I can access the admin page on port 5480 and got all the networking, time zones etc configured. All looks good there, but the link to Application Home Page returns a 404 page not found. I am not familiar with CentOS so I can't tell if it is a tomcat issue of if the directory/files even got created during the install. Using PS at the Shell prompt I do see Tomcat is running (as the admin page proves). I'm not sure where to go next.
From the admin page on port 5480, from the SolarWinds Mgmt tab, try the "Restart Alert Central" button and see if that gets it working for you.