Weird, this isn't matching:
access to dn.children="ou=group,dc=mydoman" by set="this/cn & user/uid" write
Instead, it's falling through to the "by * read" entry at the top of the tree.
It doesn't even look like it's trying to match against that ACL, actually.
I suggest you closely read slapd-access(5).
--Quanah
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Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration