|The PostgreSQL 9.0 Reference Manual - Volume 3 - Server Administration Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 274 pages
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3.3.2 Client Connection Problems
Although the error conditions possible on the client side are quite varied and application-dependent, a few of them might be directly related to how the server was started. Conditions other than those shown below should be documented with the respective client application.
psql: could not connect to server: Connection refused Is the server running on host "server.joe.com" and accepting TCP/IP connections on port 5432?
This is the generic “I couldn't find a server to talk to” failure. It looks like the above when TCP/IP communication is attempted. A common mistake is to forget to configure the server to allow TCP/IP connections.
Alternatively, you'll get this when attempting Unix-domain socket communication to a local server:
psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
The last line is useful in verifying that the client is trying to
connect to the right place. If there is in fact no server
running there, the kernel error message will typically be either
Connection refused or
No such file or directory, as
illustrated. (It is important to realize that
Connection refused in this context
does not mean that the server got your
connection request and rejected it. That case will produce a
different message, as shown in section 5.4 Authentication problems.) Other error messages
Connection timed out might
indicate more fundamental problems, like lack of network
|ISBN 9781906966072||The PostgreSQL 9.0 Reference Manual - Volume 3 - Server Administration Guide||See the print edition|