Can't Login to phpPgAdmin

Well, I figured it out - it was a combination of inexperience with PostgreSQL and very non-descriptive errors from phpPgAdmin.

Turns out I did not have TCP/IP access enabled, which meant that no PHP applications could access the database(s). To fix this, I had to make two changes:

• It seemed to work better if I set listen_addresses to '*' in postgresql.conf. I'm not sure if that's entirely necessary or not, but on a well-firewalled machine like this one is, it shouldn't be a problem.
• I had to run the command setsebool -P httpd_can_network_connect_db 1 from a terminal window to get Apache to actually get with the program and connect. I don't remember if I had to restart PostgreSQL after this step, but it probably wouldn't hurt.

One final note: I saw a few things suggesting changing a line tcpip_socket=true in postgresql.conf. This apparently does not work in PostgreSQL 9.1. In fact, it refused to start after I added that. So don't do it.

Anyways, hopefully this can help someone who runs into the same issues I did!