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I have just spent several hours trying to setup wordpress MU 1.2.4 with LDAP in to a CORP Active Directory,

MU does what wordpress does best, it just worked
LDAP auth was fantasic,
but everynow and then i was experiancing a 30 secs slow page load

Well before some of you start shouting, what i now know are obvious things,
I eventually noticed, using a cool tool called ieHeaders, that the page load delay was exactly 30 seconds every time, so came to the conclusion this was a timeout rather than a random thing. After some head scratching I remembered that some of the admin pages on wordpress get data from wordpress.org on NEW features etc

Eureeka, give the PHP http client (snoopy) a proxy server to use and everyones a winner ! :-)

[update]
This was done with?? wordpress MU 1.2.4 , and LDAP plugin 1.2.0 from http://sourceforge.net/project/showfiles.php?group_id=196841??against a WINDOWS AD / LDAP
The search and user DN need to be in this format OU=aaaa,OU=bbbb,DC=zzzz,DC=yyyy,DC=xxx
where the number number of OU fields and DC fiesl will vary depending on yoiu LDAP config