I'm getting increasingly suspicious that DNS is to blame.  If I was to do 
something like:

$conn = sybase_connect( "10.0.0.11\SQLMAIN", $user, $pass )

Would that trigger a lookup of some variety?

-----Original Message-----
From: Matijn Woudt [mailto:tijn...@gmail.com] 
Sent: 24 May 2012 13:00
To: Tom Lloyd
Cc: php-db@lists.php.net
Subject: Re: [PHP-DB] Mysterious 5 second delay on sybase_connect()

On Thu, May 24, 2012 at 10:51 AM, Tom Lloyd <tomll...@wallcolmonoy.co.uk> wrote:
> Hi there.  I'm working on a PHP-driven project on Debian Squeeze that 
> connects to an instance of Microsoft SQL Server on Windows Server 2008.
> I'm using the sybase extensions to PHP.
>
> Since I rebooted the webserver on the weekend, both the 
> sybase_connect() and sybase_pconnect() commands will sometimes take 
> exactly 5 seconds to execute.  It seems to be random whether they do 
> this or not.  I can't think of anything that could have been changed 
> by the reboot, unless a package was updated but its associated process never 
> got restarted...
>
> Does anyone know what might cause this behaviour?
>
> Cheers,
> Tom Lloyd
>

It most likely has nothing to do with PHP, but is rather a routing issue. 5 
seconds is the default connection time out for TCP/IP, so it probably makes 
sense that the connection is failing at a lower level.

- Matijn

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