Do you have any proxy defined in your browser connection settings? If so, enabled 'bypass proxy for local connections' option. Also, double check the ePO server logs.
Proxy is on and correctly configured.
I found this in my Orion.log
2017-03-14 07:34:37,886 FATAL [main] core.OrionCore - killing server. reason = Detected a possible mismatch between the server and database. Try pointing the server to the correct database (ie, db versions of extensions must match what is on the filesystem)
The server was restored from a backup of Veeam.
Good to hear - if this has been answered/helpful then mark it - it will help others when they search the forum.