If shmem's suggestion does not work for you, then you may want to look at (untested) replacing the parens in question with their hex representations per RFC 4514, so the string becomes "(cn = John Wyner \64DRAFT\65)".
Hope that helps.
In reply to Re^2: LDAP. Parantheses present in the filter cn value
by atcroft
in thread LDAP. Parantheses present in the filter cn value
by srini.here
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