This means that the postgres DB which is in charge of the GUI is not running properly.
In order to fix this please use the following procedure:
1. Search for user sphsvc in passwd file under /etc (it must be exists from SD3.7)
2. Check if there is a process called postmaster running under this user (sphsvc) or run the command ps -fu sphsvc
3. If not do the following:
a. su - sphsvc
b. remove the data/postmaster.pid file
c. go to bin directory
d. run pg_ctl start (using full path)
Or if you have existed back to root, you can run the command:
su - sphsvc -c "/usr/local/hostdir/sphera_db/bin/pg_ctl start"
4. Repeat #2 to check if the process is up, and if postmaster still not running try to start pg_ctl in following way:
su - sphsvc -c "/usr/local/hostdir/sphera_db/bin/pg_ctl start -l /tmp/pg.log"
After getting message like "postmaster successfully started" check the log file /tmp/pg.log
If something like "Lock file "/usr/local/accounts/[P.VDS]/etc/hd/tmp/.s.PGSQL.5432.lock" already exists." exists in log, remove* this lock file and try (3) again.
* rm /usr/local/accounts/[P.VDS]/etc/hd/tmp/.s.PGSQL.5432.lock
Message from the pg_ctl "postmaster successfully started" DOESEN'T MEAN ANYTHING.