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Re: Problem about connecting PostgreSQL through TCP/IP

From: Hui Chen <gray(dot)chenhui(at)gmail(dot)com>
To: Gnanavel S <s(dot)gnanavel(at)gmail(dot)com>
Cc: pgsql-php(at)postgresql(dot)org
Subject: Re: Problem about connecting PostgreSQL through TCP/IP
Date: 2005-08-18 20:39:46
Message-ID: 923c3c14050818133930da1cf0@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-php
Thanks a lot! If I typed the password wrong, I should be able to see a
corresponding entry in the log file. The entry should look like
"FATAL:  password authentication failed for user foo". However, I did
not see any entry corresponding to the failed connection at all.
Therefore, I ruled out the possibility that the wrong password was the
reason.

Gray

On 8/17/05, Gnanavel S <s(dot)gnanavel(at)gmail(dot)com> wrote:
> 
> 
> 
> On 8/14/05, Hui Chen <gray(dot)chenhui(at)gmail(dot)com> wrote:
> > Hello, everyone,
> > 
> > Can anyone help me? I am quite frustrating now. I have been trying to
> > connect PostgreSQL server through TCP/IP connection using PHP. I was
> > not successful. Could please read the following and give me some 
> > hints. Thanks a million.
> > 
> > OS: Fedora Core 4 ("uname -s -r" yields "Linux 2.6.12-1.1398_FC4smp")
> > PostgreSQL: version 8.0.3
> > PHP: version 5.0.4
> > 
> > In postgresql.conf, these three lines were inserted, 
> > listen_addresses = '*'
> > port = 5432
> > max_connections = 100
> > 
> > The following lines were inserted to pg_hba.conf:
> > local   all         all                                  
>     password
> > host    all         all         127.0.0.1/32            password
> > host    all         all         192.168.0.0/1          password
> > 
> > restart posgresql by
> > /sbin/service postgresql restart
> > The server was restarted OK.
> > 
> > The PHP script used to connect database is  as follows, 
> > <?php
> >   $conn = pg_connect("host=localhost port=5432 dbname=foodb user=foo
> > password=foo") or die ("Can not connect to postgres");
> >    $result=pg_exec("SELECT * FROM footbl");
> >    $fetch = pg_fetch_row($result);
> >    print "<html><body>";
> >    print $fetch[0];
> >    print "<body></html>";
> > 
> >    pg_close($conn); // Close this connection
> > ?>
> > 
> > Assume this PHP script is named as "connectdb.php", then on
> > commandline, when I run the following,
> >                       php connectedb.php
> > I see correct results, e.g.,
> > <html><body>foo<body></html>
> > 
> > On commandline again, I used the following to connect database,
> > psql -d foodb -h localhost -p 5432 -U foo
> > Password: ************
> Whether the password you typed here is "foo"?
>  
> > 
> > Welcome to psql 8.0.3, the PostgreSQL interactive terminal.
> > 
> > Type:  \copyright for distribution terms 
> >        \h for help with SQL commands
> >        \? for help with psql commands
> >        \g or terminate with semicolon to execute query
> >        \q to quit
> > 
> > foodb=>
> > 
> > It is OK. Then I disabled "iptables" temporarily for testing purpose by 
> > /sbin/service iptables stop
> > Flushing firewall rules:                                 
>  [  OK  ]
> > Setting chains to policy ACCEPT: filter                    [
>  OK  ]
> > Unloading iptables modules:                              
>  [  OK  ]
> > 
> > On localhost, I tried this command,
> > telnet localhost 5432
> > after hit "enters", telnet exited. I checked postgresql_%S.log and see
> > "LOG:  invalid length of startup packet" 
> > which means postgresql server indeed saw the telnet connection.
> > 
> > I tried this on any of my other machines in the LAN, I observed the same
> thing.
> > 
> > In summary, it seemed the postgresql allowed TCP/IP connection, and 
> > worked well. However, when I ran the PHP script through web browser, I
> > did not get connection. Instead, in Apache web server's error_log, I
> > see
> > [client 192.168.1.10] PHP Warning:  pg_connect() [<a 
> > href='function.pg-connect'>function.pg-connect</a>]: Unable to connect
> > to PostgreSQL server: could not connect to server: Permission
> > denied\n\tIs the server running on host &quot;localhost&quot; and 
> > accepting\n\tTCP/IP connections on port 5432? in /foo/connectdb.php on
> > line 2
> > 
> > Interestingly, when I checked the log file for postgresql again, it
> > did not have anything for this connection failure. It seemed the 
> > connection did not send to the database server at all. However,
> > 1) I disabled firewall
> > 2) I can telnet the ports
> > 3) I can run the script from commandline
> > 
> > What could go wrong?
> > 
> > Thanks a lot for your reading this lengthy email. Waiting for your help! 
> > 
> > Gray
> > 
> > ---------------------------(end of
> broadcast)---------------------------
> > TIP 4: Have you searched our list archives?
> > 
> >                http://archives.postgresql.org 
> > 
> 
> 
> 
> -- 
> with regards,
> S.Gnanavel
> Satyam Computer Services Ltd.

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