HI!
Is the cancel operation already supported in RE23? It seems so (playing around with it with python-ldap).
But supportedFeatures in root DSE does not contain 1.3.6.1.1.8.
RFC 3909 states:
Servers SHOULD indicate their support for this extended operation by providing 1.3.6.1.1.8 as a value of the 'supportedExtension' attribute type in their root DSE. A server MAY choose to advertise this extension only when the client is authorized to use it.
Ciao, Michael.