Re: How to confirm the pg_hba.conf service is correctly working

I may be a bit off , but can you try a couple of things, other than a fresh install, incase you have time to debug more.

 

is it possible to snapshot the vm, and and set it up in a controlled environment where you can play around with incoming connections at the network layer 

beyond the vm.

With that, is it possible for you to use gdb and debug a connection to the postmaster.

you can setup using below,

and then you can put a breakpoint at this function and check the input lines it gets for parsing.

https://github.com/postgres/postgres/blob/6ab42ae36713b1e6f961c37e22f99d3e6267523b/src/backend/libpq/hba.c#L779 

but maybe this helps identify why other ips are being allowed.

to be more paranoid, you can all reject from the ip you are trying to make a connection, and trace that specific rule.

this might be an overkill and maybe a waste of effort given you already can query the hba view, but incase you want to try out.