[please keep replies on the list]

IŽm sorry, but that is not a qualified answer...

OK, I'll try to be more precise.

1) "TelUser": not a standard track attribute. Please provide its specification (significantly, its syntax) otherwise the point is moot.

2) few standard track syntaxes allow zero length strings; see RFC4517. In short, RTFM to see if the syntax of your "TelUser" allows a zero length string.

It appears from the description of your problem, that you want to zero out a value, not actually store a zero length value. This is common of rdbms users, where tables have a fixed structure and when some field is not defined one just wants to store an empty value in it. LDAP, instead allows object to have optional attributes; when optional attributes are not needed, they should not appear at all.

If your problem is with the tool you're using, that has nothing to do with OpenLDAP; so please ask the appropriate forum.

p.

----- Ursprüngliche Nachricht ----- Von: masarati@aero.polimi.it An: norbert.weckert@arcor.de Cc: openldap-technical@openldap.org Gesendet: 13.04.12 23:26 Betreff: Re: How can I set an LDAP-attribute to "null" (empty)?

...

Hello,

to fill data into an LDAP-structure, I use the software HP Connect IT. Sometimes it is necessary to clear an attribute.

But there is the following error message:

Error occured while modifiying the entry (LDAP) TelUser value #0 invalid per Syntax LDAP API Invalid Syntax

Can you tell me, what I have to do, so that LDAP accepts an "empty value"?

Nearly no syntax accepts the empty value. What you need to do is delete the attribute using a standard LDAP modify operation. In LDIF:

dn: (the DN) changetype: modify delete: TelUser

How to do it using that specific software is up to you.

p.