Hello,
Please Try this steps:
Open your host file from
C:\WINDOWS\system32\drivers\etc
Have you added your server name and IP address?
If so then change it to local host like this
127.0.0.1 localhost
Then Logging again to SPC.
Also, try these steps below:
1.Open Internet Explorer
2. In the url type : http://localhost:8014
If you get a login screen, then you can try to login from there and let us know if that works.
Also, I have seen that in SEP 12 SBS, a lot of information is available in tomcat\logs\upgrade.log
Let us know if you have anything in there.