ldap_connect() Delay

boatmas

Hi,

I have small problem with the ldap_connect() function, it is causing a 2.5-2.7 second delay every time it is called. What is strange is that anything can be passed as an argument, an LDAP server, or just a string of text, as the connection actually occurs at the ldap_bind() stage. The web server is run on a domain controller, so the LDAP server is local. Connecting to the LDAP server from a client machine does not produce a delay.

I've isolated the problem to PHP (versions 4.4.4, 4.4.7 and 5.2.3 are affected), as the same results can be reproduced with any LDAP server (or random text) and the server machine. Using PHP on other machines, or Python on the server are not affected by this.

Can anyone recommend any way to get some debug output from the ldap_connect() function?

alimadzi

Not sure about debug output. Maybe it would help if you post the PHP code you're using. I've used LDAP a lot, so maybe I would spot something you could change.

boatmas

The only code is the ldap_connect() function. That's it.

It only affects when run on the primary domain controller, which is also the web server. At the moment it's taking 0.1 seconds to perform the ldap_connect() function, but strangely most of the time it takes 2.5-2.7 seconds.

alimadzi

Not sure what we can do for you with the info you've provided. Sounds like it may have resolved itself anyway.

boatmas

This is the code:
list($usec, $sec) = explode(" ", microtime());
$start = ((float)$usec + (float)$sec);

$conn = ldap_connect("<anything>");

list($usec, $sec) = explode(" ", microtime());
$end = ((float)$usec + (float)$sec);
echo $end - $start;

This is the output:
2.58611798286

Any suggestions?

alimadzi

Not sure what to tell you. Doesn't appear to be a programming issue since all you're doing is connecting. I would try it on different servers or send that info to your hosting company. Good luck...