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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.18.17
+----------------------
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- If a response from an authoritative server has its RCODE set to
+  FORMERR and contains an echoed EDNS COOKIE option that was present in
+  the query, :iscman:`named` now retries sending the query to the
+  same server without an EDNS COOKIE option. :gl:`#4049`
+
+- The ``relaxed`` QNAME minimization mode now uses NS records. This
+  reduces the number of queries :iscman:`named` makes when resolving, as
+  it allows the non-existence of NS RRsets at non-referral nodes to be
+  cached in addition to the normally cached referrals. :gl:`#3325`
+
+Bug Fixes
+~~~~~~~~~
+
+- The ability to read HMAC-MD5 key files, which was accidentally lost in
+  BIND 9.18.8, has been restored. :gl:`#3668` :gl:`#4154`
+
+- Several minor stability issues with the catalog zone implementation
+  have been fixed. :gl:`#4132` :gl:`#4136` :gl:`#4171`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.