Security Software

I have been running iPlanet Directory Server 4.16 on Solaris 8 SPARC
for about half a year now. Recently, the following message started
appearing in the LDAP instance's error log every 5 minutes or so:

[17/Sep/2003:14:28:13 -0400] - slapi_str2entry_fast: entry has no dn:
''
[17/Sep/2003:14:28:13 -0400] - str2entry returned NULL for id 143,
string=""
[17/Sep/2003:14:33:24 -0400] - slapi_str2entry_fast: entry has no dn:
''
[17/Sep/2003:14:33:24 -0400] - str2entry returned NULL for id 143,
string=""

This went on unnoticed for a couple of weeks. I have finished a
preliminary examination of our applications using the directory, as
well as local and remote crontabs. So far I have found no explanation
for the error message, its meaning and striking regularity (the
message appears roughly every 5-6 minutes).

I noticed that the messages always refer to ID 143. Would this be an
LDAP entry ID in the db/id2entry.db2 file for the instance? Or would
this be an indexed entry ID in some of the LDAP indices? Is there a
way to pull the entry from LDAP by numeric ID in the .db2 files and
examine it?

Finally, would it make any difference that we are replicating LDAP
(without SSL)? The two instances are in sync, and only the supplier is
in use and logs these messages; the consumer is just a standby system
and only logs nightly backups.

Thank you,
Zlatin