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# Connection errors

When connecting to a PostgreSQL server, you might get error messages that need some more explanations. If you encounter them, please read the following information carefully, we’re sure they will help you.

- notrunning
- no-hba

## could not connect to Server: Connection refused

If this message appears, there are two possible reasons for this: either the server isn’t running at all. Simply start it.

The other non-trivial cause for this message is that the server isn’t configured to accept TCP/IP requests on the address shown.

For security reasons, a PostgreSQL server “out of the box” doesn’t listen on TCP/IP ports. Instead, it has to be enabled to listen for TCP/IP requests. This can be done by adding tcpip = true to the postgresql.conf file for Versions 7.3.x and 7.4.x, or listen_addresses=’*’ for Version 8.0.x and above; this will make the server accept connections on any IP interface.

For further information, please refer to the PostgreSQL documentation about runtime configuration.

## FATAL: no pg_hba.conf entry

If this message appears, your server can be contacted correctly over the network, but isn’t configured to accept your connection. Your client isn’t detected as a legal user for the database.

You will have to add an entry in the form host template1 postgres 192.168.0.0/24 md5 for IPV4 or host template1 postgres ::ffff:192.168.0.0/120 md5 for IPV6 networks to the pg_hba.conf file.

For further information, please refer to the PostgreSQL documentation about client authentication.

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