I setup a new lookup in our Postfix just like the one we have used for transports for some time, but now using ipHostNumber to allow relay. After setting up, I started receiving...

Mar 7 09:43:04 esmtp slapd[22766]: <= bdb_equality_candidates: (ipHostNumber) index_param failed (18)

So, I added ipHostNumber to my list of indexes already established for other Postfix lookups...

# Following indexes for postfix virtual lookups index associatedDomain,mail,mailLocalAddress,ipHostNumber eq

The errors go away, but now my lookup does returns nothing. And as soon as I remove the index and try lookup again, it returns the result fine, but slow of course and with the error above. However, even with it removed, I still see the index in my file system...

esmtp# ls -lah /home/openldap/ipHostNumber.bdb -rw------- 1 ldap ldap 8.0K Mar 7 08:32 /home/openldap/ipHostNumber.bdb

Can someone offer some guidance on what I should try next?

Thanks in advance.