Ldap operation 'RESULT' omitted

Hi,
I am facing a problem here with a PHP web application, hosted on apache which accesses the data on the LDAP server.(LDAP server and webserver share the system)
The script works for most of the time but sometimes it fails with no error page on http. But at the LDAP side the result for the operation gets omitted.(pls see log below, result for op=27 missing)
LDAP server: sunone directory server 5.1 sp3
Other Information:
Also, the LDAP connection breaks at exact 5 mins.
The time limit at LDAP server is much higher.
The system TCP timeout limit is also high.(ldapsearch utility works well all the time for the LDAP server).
At PHP the socket timeout is without limits.
At the apache server the TimeOut been set to 5 mins.
LDAP logs excerpt:
17/May/2004:03:34:58 +0000] conn=1888 op=27 SRCH base="ou=people,dc=test,dc=com"
scope=1 filter="(&(objectClass=mailuser)(!(objectClass=w2kuser))(l=0
9))" attrs="sn givenName"
[17/May/2004:03:39:58 +0000] conn=1888 op=28 UNBIND
[17/May/2004:03:39:58 +0000] conn=1888 op=28 fd=114 closed - U1
The search above is an unindexed search and take usually between 350-500 seconds depending upon the server load.
Thanks for your help in advance.
Cheers,
Vivek

The only thing I can think of is that maybe Apache is smart enough to issue the initial connection to the LDAP server with the same timeout as the http server is configured for (search time limit is a parameter that can be set by the client when initiating an LDAP operation). If you increase the timeout for Apache to 10 minutes, does the problem still occur?

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