GUI not answering

New to NA and running NA 10.40 on a RHEL 7.5 VM.   GUI has answered before , however after a reboot, it's not answering now. The "na" Oracle process are running on its associated DB server.

Ran the following on the NA server itself :

# /etc/init.d/truecontrol restart
Stopping TrueControl Management Engine ... done.
Stopping TrueControl Syslog Server ... done.
Stopping TrueControl TFTP Server ... done.
Stopping TrueControl FTP Server ... done.
Stopping TrueControl SA Client ... done.
Stopping TrueControl BVD Collector ... done.
Starting TrueControl TFTP Server ... done.
Starting TrueControl Syslog Server ... done.
Starting TrueControl Management Engine ... done.
Starting TrueControl FTP Server ... done.
Starting TrueControl SA Client ... done.
Starting TrueControl BVD Collector ... done.
[root ~]#

Are there other things I can do to troubleshoot this ?

Thanks