As we discovered by mistake, if you are one of those people lucky enough to work in multiple technologies, sometimes you can end up hurting yourself and spending far too long trying to figure out why.
It turns out that the default PostgreSQL database port is 5432 – the same as the SPFx workbench.
Installing PostgreSQL causes it to run automatically on computer start. So there is already something listening on port 5432 and your workbench appears to not work as you wanted it to 😦
Anyway you have a few choices to get your workbench to work:
- Stop postgreSQL running automatically on computer start
- Change the postgreSQL port