Start the importer thread on PSS and SSS and restart NGA after the setting was done on all 4 SCADA machines (make sure to choose a free port for the importer thread).
The PostgreSQL® configuration must be changed so that the SSS can access the PSS DB and vice versa. Edit the /var/lib/pgsql/data/pg_hda.conf file as follows:
Figure 1. Add the Server Addresses
For more information on the pg_hda.conf, see also: https://www.postgresql.org/docs/13/auth-pg-hba-conf.html) .
Note: Make sure that the firewall allows the PSS to connect to SSS database and vice versa.
Configure the listening_address setting: listen_addresses = '*' instead of localhost in the postgresql.conf (this must be configured also if
the DB runs on another machine than SCADA server). For how to configure the postgresql.conf, see chapter PostgreSQL® in a Distributed System.
If you have more than one PostgreSQL® backend, make sure that only one of them is running in-proc and all the
others as out-of-proc.
Each of the out-of-proc backends requires a different (free) port in order to work properly.
Note: However, note all backends that serve as synchronizations source must have one of the following execution types:
In-Proc (Backend as Plugin)
Out-Of-Proc (Separate Process) / In-Proc for Direct Read
Note: Make sure that the firewall allows the PSS to connect to SSS database and vice versa.
