After posting an issue in thee Community Forum (here), I received a phone call from “QuickBooks Support “ wanting more information and then wanted to connect to...
I've resolved my issue.Unfortunately QB decided that RDS was no longer an option and pulled it from up without notification.I cant vouch for other configuration...
They wanted me to upgrade too but v18 is really little difference from v12. I guess I'm going to install QuickBooks on my POS server and map to my QB data.
According to support:"As of now, RDS setup is no longer recommended since it causes disruption on the database. If your main goal is to sync POS and QB, we can ...