How to connect to an remote PostgreSQL database on Ubuntu using pgAdmin3?

Question

I'm trying to setup a PostgreSQL database on an Ubuntu machine. I would like to be able to access it using pgAdmin3 from a remote machine. How do I setup this?

I have installed the PostgreSQL database on Ubuntu using:

sudo apt-get install postgresql

In my /etc/postgresql/9.1/main/pg_hba.conf have I this line:

host all all all password

so it should accept connections from all IPv4-addresses and passwords should be sent in clear text (this is for development reasons).

If I run this command to see what services is running:

sudo netstat -tulpn

I can see these lines, that is showing that PostgreSQL is accepting connections on the default port:

tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN
3561/postgres

When I try to connect to this PostgreSQL server from a remote computer on the same local network I get this error message:

Server doesn't listen

The server doesn't accept connections: the connection library reports

could not connect to server: Connection refused Is the server running on host "10.0.1.7" and accepting TCP/IP connections on port 5432?

I used postgres as username and no password. But I have also tried with postgres as password. On the local server I can login using:

sudo -u postgres psql postgres

How can I connect to a PostgreSQL database running on Ubuntu from a remote machine using pgAdmin3?

Answer 1

The line in your netstat report shows that the database is only listening on localhost:5432 (127.0.0.1) for incoming tcp connections.

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN 3561/postgres

So it can only accept local tcp connections regardless of what permissions you've specified in pg_hba.conf. pg_hba.conf only specifies allowed connections, but does not specify what interfaces your service will listen to.

The addresses the server listens on is specified with the listen_addresses GUC in postgresql.conf. If you want the server to listen for remote connections you should specify the ip(s) you want it to listen on or * to listen on all available interfaces on the host.

To have your postgresql server listen on all interfaces on the host, you should have the following line in postgresql.conf:

listen_addresses = '*'

• Jonas: but I have already specified all in the pg_hba.conffile... so it should accept connetions from all ip-addresses.
• dbenhur: Perhaps I could have said it more clearly. pg_hba doesn't specify what the database listens on, only what protocol/db/user/remote-addr connections are permitted.
• Jonas: Ok, so how do I fix this? do you have any suggestions?
• dbenhur: you fix it by putting a line listen_addresses = '*' in postgresql.conf and restarting your server.
• Jonas: Thanks, this solved this problem. Now I just got problems with the default password :(