Slapd running out of file descriptors (leak?)

Hi, I have OpenLDAP 2.3.27, Redhat 5 package, and it's running out of file descriptors suddendly. It's works fine a few days, but runs out of FDs and the the solution is restart.

I think It's a bug, because see the following weird thing with lsof:

slapd 19157 ldap 303u sock 0,5 193051928 can't identify protocol

The file descriptors from 159 up to 4094 are like that. Under normal operations I don't see FDs like these, only have 100 FDs aprox in the rush hour.

I don't have any interesting in the log and this is not a file descriptor limit problem.

regards, diegows