Why we can not search any info during the client is normally
running? But
once I rebooted the client site, it worked well and could accept search requests? How to solve this problem:)
There are quite a few potential problems with your approach. The first one that comes to mind is that the LDAP server has a cache. If you use BDB replication, without special measures, that cache will not be consistent with the database content. And bad stuff will happen as a result.