Directory server throws "Failed to initialize CLDAP Plugin" error after enabling AD trust on IPA/IdM

Issue

After ipa-adtrust-install , directory server shows following error while restarting the service.

Starting dirsrv:
    LINUX...[25/Nov/2013:15:37:06 +0100] ipa_cldap_init_service - [file ipa_cldap.c, line 148]: Failed to create socket
[25/Nov/2013:15:37:06 +0100] ipa_cldap_init - [file ipa_cldap.c, line 207]: Failed to initialize CLDAP Plugin [  OK  ]