I have a problem with my 7.6 standalone vro appliance where I cannot access the control center or web client suddenly. Java client and the web page on port 8281 are fine. I've restored from backup and even created a new vro from ova as a test and they all seem to have the problem yet other instances of vro in our environment are still ok.
I agree that this would appear to be a network/firewall issue but if I go onto the appliance and run: curl -k -vvv https://localhost:8283 the connection doesn't get past the client hello. If I can't even connect to the port from the appliance itself then I would think the problem is within the appliance. Trying the same curl command to port 8281 works just fine.
Anyone see this before or have any ideas?
Have you rebooted the appliance recently? It's possible that the controlcenter service is not set to auto-start on reboot
If you SSH to the appliance as root and do this
service vco-configurator restart
Then wait a few minutes and try the controlcenter page again?