Re: Intermittent Postgres Connection refused Errors (JDBC)

Thanks for the response. No, I am not exceeding the max limit. I tried a test
which would exceed the max connections (which is 100 - set in postgresql.conf).
The error at that point is
org.postgresql.util.PSQLException: FATAL: sorry, too many clients already

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From: aaron(dot)bono(at)gmail(dot)com [mailto:aaron(dot)bono(at)gmail(dot)com] On Behalf Of Aaron Bono
Sent: Tuesday, May 01, 2007 5:59 PM
To: ksrinivas(at)coriendo(dot)com
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: [ADMIN] Intermittent Postgres Connection refused Errors (JDBC)

On 5/1/07, Srinivas Kotapally <ksrinivas(at)bisil(dot)com> wrote:

Hi

I am managing an application that uses the Postgres backend. Of late we have
started getting connection refused errors every now and then. We have not been
able to identify the cause of this. Any hints or known bugs that I should be
aware of? Thanks for any help extended!

Regards

Srinivas

Here is the environment I work in:
Application is a Java app residing on a web server and is running on Tomcat.
Versions:
jdk: 1.5.0_02
Tomcat 5.5.23
Web server: httpd-2.0.52-28.ent.centos4
Kernel: Linux version 2.6.9-42.0.10.ELsmp (mockbuild(at)builder5(dot)centos(dot)org
<mailto:mockbuild(at)builder5(dot)centos(dot)org> ) (gcc version 3.4.6 20060404 (Red Hat
3.4.6-3)) #1 SMP Tue Feb 27 09:40:21 EST 2007
Postgres: 8.1.8 (64 bit version) -
postgresql-libs-8.1.8-1PGDG
postgresql-8.1.8-1PGDG
postgresql-server-8.1.8-1PGDG
postgresql-contrib-8.1.8-1PGDG

We use the JDBC2 driver that comes with Postgres.

The specific error we get is:

CDBConnectionPool.newConnection() : SQLException=
org.postgresql.util.PSQLException: Connection refused. Check that the hostname
and port are correct and that the postmaster is accepting TCP/IP connections.

Are you exceeding the maximum allowed connections in PostgreSQL? I would start
by checking the PostgreSQL logs. If nothing shows up, it may be a network or
application configuration issue.

-Aaron

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Aaron Bono
Aranya Software Technologies, Inc.
http://www.aranya.com
http://codeelixir.com
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