I think I have seen something similar, but not 100%.. But I think it was browser related, which browser are you using..
Also, https://servername:port should be enough to login.
Which version of ePO are you running ?
Tried IE8 and Firefox. Tried it from several machines and on the EPO Server as well. No dice. EPO 4.6.1 .
Sounds like Tomcat hasn't started up yet. If the services were recently started, you might need to give them a couple of minutes to finish starting up. Take a look at orion.log, any errors starting up tomcat will show up there. (make sure you have database connectivity)