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CLOSE_WAIT TCP connection


Could you please help me to understand the problem that i didn't really resolv..

I have my openldap platform which has been working well

OpenldapServer : 2.3.39
Openldapclient : RedHat 5.x  with nss_ldap and pam_ldap.so release 253-51

All my servers were configured with : /etc/nsswitch.conf /etc/ldap.conf and /etc/pam.d/sshd
The user authentification with ssh connection is perfect. The filter of authorisation host connection is ok too.
Everything is ok.

But i've recently realized that i have a lot of TCP CLOSE_WAIT connexion from differents servers to my OpenLdapServer.
These connexions are somethings like :

tcp        1      0 IP_CLIENT:44633         OPENLDAP_SERVER:389            CLOSE_WAIT  3321/crond          off (0.00/0/0)
tcp        1      0 IP_CLIENT:44674         OPENLDAP_SERVER:389            CLOSE_WAIT  2426/nagios    off (0.00/0/0)
tcp        1      0 IP_CLIENT:44956         OPENLDAP_SERVER:389            CLOSE_WAIT  4652/ntpd    off (0.00/0/0)

And so on ..

I have ~20 TCP CLOSE_WAIT connection to OPENLDAP_SERVER
I don't understand when these applications tried to connect to OPENLDAP server and why i have TCP persistent connexion.

Meanwhile, I only have SSHD configured to use pam_ldap.so ...

Someone can help me please ?!?

Thanks by advance for your answer and i m sorry about my English