diff --git a/tests/data/regressions/its8427/its8427 b/tests/data/regressions/its8427/its8427
new file mode 100755
index 0000000000..c2f3aeb923
--- /dev/null
+++ b/tests/data/regressions/its8427/its8427
@@ -0,0 +1,314 @@
+#! /bin/sh
+# $OpenLDAP$
+## This work is part of OpenLDAP Software <http://www.openldap.org/>.
+##
+## Copyright 1998-2019 The OpenLDAP Foundation.
+## All rights reserved.
+##
+## Redistribution and use in source and binary forms, with or without
+## modification, are permitted only as authorized by the OpenLDAP
+## Public License.
+##
+## A copy of this license is available in the file LICENSE in the
+## top-level directory of the distribution or, alternatively, at
+## <http://www.OpenLDAP.org/license.html>.
+
+echo "running defines.sh"
+. $SRCDIR/scripts/defines.sh
+
+if test $WITH_TLS = no ; then
+    echo "TLS support not available, test skipped"
+    exit 0
+fi
+
+if test $SYNCPROV = syncprovno; then
+    echo "Syncrepl provider overlay not available, test skipped"
+    exit 0
+fi
+
+TMP=$TESTDIR/tmp
+
+mkdir -p $TESTDIR
+mkdir -p $TESTDIR/srv1/slapd.d $TESTDIR/srv1/db \
+    $TESTDIR/srv2/slapd.d $TESTDIR/srv2/db
+
+cp -r $DATADIR/tls $TESTDIR
+
+$SLAPPASSWD -g -n >$CONFIGPWF
+
+if test x"$SYNCMODE" = x ; then
+    SYNCMODE=rp
+fi
+case "$SYNCMODE" in
+    ro)
+        SYNCTYPE="type=refreshOnly interval=00:00:00:03"
+        ;;
+    rp)
+        SYNCTYPE="type=refreshAndPersist interval=00:00:00:03"
+        ;;
+    *)
+        echo "unknown sync mode $SYNCMODE"
+        exit 1;
+        ;;
+esac
+
+nullExclude=""
+test $BACKEND = null && nullExclude="# "
+
+KILLPIDS=
+
+cat > $TMP <<EOF
+dn: cn=config
+objectClass: olcGlobal
+cn: config
+olcTLSCertificateFile: $TESTDIR/tls/certs/localhost.crt
+olcTLSCertificateKeyFile: $TESTDIR/tls/private/localhost.key
+
+EOF
+
+if test "$SYNCPROV" = syncprovmod ; then
+  cat <<EOF >> $TMP
+dn: cn=module,cn=config
+objectClass: olcModuleList
+cn: module
+olcModulePath: $TESTWD/../servers/slapd/overlays
+EOF
+  if [ "$SYNCPROV" = syncprovmod ]; then
+  echo "olcModuleLoad: syncprov.la" >> $TMP
+  fi
+  echo "" >> $TMP
+fi
+
+if [ "$BACKENDTYPE" = mod ]; then
+cat <<EOF >> $TMP
+dn: cn=module,cn=config
+objectClass: olcModuleList
+cn: module
+olcModulePath: $TESTWD/../servers/slapd/back-$BACKEND
+olcModuleLoad: back_$BACKEND.la
+
+EOF
+fi
+if test $INDEXDB = indexdb ; then
+INDEX1="olcDbIndex: objectClass,entryCSN,reqStart,reqDN,reqResult eq"
+INDEX2="olcDbIndex: objectClass,entryCSN,entryUUID eq"
+else
+INDEX1=
+INDEX2=
+fi
+cat >> $TMP <<EOF
+dn: cn=schema,cn=config
+objectclass: olcSchemaconfig
+cn: schema
+
+include: file://$ABS_SCHEMADIR/core.ldif
+
+include: file://$ABS_SCHEMADIR/cosine.ldif
+
+include: file://$ABS_SCHEMADIR/inetorgperson.ldif
+
+include: file://$ABS_SCHEMADIR/openldap.ldif
+
+include: file://$ABS_SCHEMADIR/nis.ldif
+
+dn: olcDatabase={0}config,cn=config
+objectClass: olcDatabaseConfig
+olcDatabase: {0}config
+olcRootPW:< file://$CONFIGPWF
+
+dn: olcDatabase={2}$BACKEND,cn=config
+objectClass: olcDatabaseConfig
+${nullExclude}objectClass: olc${BACKEND}Config
+olcDatabase: {2}$BACKEND
+olcSuffix: $BASEDN
+${nullExclude}olcDbDirectory: ./db
+olcRootDN: $MANAGERDN
+olcRootPW: $PASSWD
+$INDEX2
+EOF
+
+echo "Configuring provider"
+cd $TESTDIR/srv1
+$SLAPADD -F ./slapd.d -n 0 -d-1 < $TMP > $TESTOUT 2>&1
+
+$SLAPADD -F ./slapd.d -n 0 -d-1 <<EOF >> $TESTOUT 2>&1
+dn: olcOverlay=syncprov,olcDatabase={1}$BACKEND,cn=config
+objectClass: olcOverlayConfig
+objectClass: olcSyncProvConfig
+olcOverlay: syncprov
+EOF
+
+echo "Starting provider..."
+$SLAPD -F ./slapd.d -h "$SURIP1 ldaps://127.0.0.2:$PORT1" -d $LVL $TIMING > $LOG1 2>&1 &
+MASTERPID=$!
+if test $WAIT != 0 ; then
+    echo MASTERPID $MASTERPID
+    read foo
+fi
+KILLPIDS="$MASTERPID"
+cd $TESTWD
+
+echo "Using ldapsearch to check that provider is running..."
+for i in 0 1 2 3 4 5; do
+    $LDAPSEARCH -o tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt -s base -b "" -H $SURIP1 \
+        'objectclass=*' > /dev/null 2>&1
+    RC=$?
+    if test $RC = 0 ; then
+        break
+    fi
+    echo "Waiting $SLEEP1 seconds for slapd to start..."
+    sleep $SLEEP1
+done
+
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Configuring consumer"
+cd $TESTDIR/srv2
+$SLAPADD -F ./slapd.d -n 0 -d-1 < $TMP >> $TESTOUT 2>&1
+
+$SLAPMODIFY -F ./slapd.d -n 0 -d-1 <<EOF >> $TESTOUT 2>&1
+dn: olcDatabase={1}$BACKEND,cn=config
+changetype: modify
+add: olcSyncRepl
+olcSyncRepl: rid=001 provider=ldaps://127.0.0.2:$PORT1
+  binddn="$MANAGERDN" bindmethod=simple credentials=$PASSWD
+  searchbase="$BASEDN" $SYNCTYPE retry="3 +" timeout=3
+  tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt tls_reqcert=allow
+EOF
+
+echo "Starting consumer..."
+$SLAPD -F ./slapd.d -h $URI2 -d $LVL $TIMING > $LOG2 2>&1 &
+SLAVEPID=$!
+if test $WAIT != 0 ; then
+    echo SLAVEPID $SLAVEPID
+    read foo
+fi
+KILLPIDS="$MASTERPID $SLAVEPID"
+cd $TESTWD
+
+echo "Using ldapsearch to check that consumer is running..."
+for i in 0 1 2 3 4 5; do
+    $LDAPSEARCH -s base -b "" -H $URI2 \
+        'objectclass=*' > /dev/null 2>&1
+    RC=$?
+    if test $RC = 0 ; then
+        break
+    fi
+    echo "Waiting $SLEEP1 seconds for slapd to start..."
+    sleep $SLEEP1
+done
+
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Populating provider"
+$LDAPADD -D "$MANAGERDN" -H $SURIP1 -w $PASSWD -o \
+    tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt \
+    -f $LDIFORDERED >> $TESTOUT 2>&1
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapadd failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Waiting for consumer to sync..."
+sleep $SLEEP2
+
+$LDAPSEARCH -b "$BASEDN" -H "$URI2" -D "$BABSDN" -w bjensen \
+    '(objectClass=*)' >> $SEARCHOUT 2>&1
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Filtering ldapsearch results..."
+$LDIFFILTER < $SEARCHOUT > $SEARCHFLT
+echo "Filtering original ldif used to create database..."
+$LDIFFILTER < $LDIFORDERED > $LDIFFLT
+echo "" >> $LDIFFLT
+echo "Comparing filter output..."
+$CMP $SEARCHFLT $LDIFFLT > $CMPOUT
+
+if test $? != 0 ; then
+    echo "Comparison failed"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+fi
+
+echo "Stopping the provider, sleeping $SLEEP2 seconds and restarting it..."
+kill -HUP "$MASTERPID"
+wait $MASTERPID
+sleep $SLEEP2
+
+echo "======================= RESTART =======================" >> $LOG1
+cd $TESTDIR/srv1
+$SLAPD -F slapd.d -h "$SURIP1 ldaps://127.0.0.2:$PORT1" -d $LVL $TIMING >> $LOG1 2>&1 &
+MASTERPID=$!
+if test $WAIT != 0 ; then
+    echo MASTERPID $MASTERPID
+    read foo
+fi
+KILLPIDS="$MASTERPID $SLAVEPID"
+cd $TESTWD
+
+echo "Using ldapsearch to check that provider is running..."
+for i in 0 1 2 3 4 5; do
+    $LDAPSEARCH -o tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt -s base -b "" -H $SURIP1 \
+        'objectclass=*' > /dev/null 2>&1
+    RC=$?
+    if test $RC = 0 ; then
+        break
+    fi
+    echo "Waiting $SLEEP1 seconds for slapd to start..."
+    sleep $SLEEP1
+done
+
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Updating provider"
+$LDAPMODRDN -H $SURIP1 -D "$MANAGERDN" -w $PASSWD \
+    -o tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt <<EOF
+$BABSDN
+cn=Babs
+EOF
+
+if test $RC != 0 ; then
+    echo "ldapmodrdn failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Waiting $SLEEP1 seconds for syncrepl to receive changes..."
+sleep $SLEEP1
+
+$LDAPWHOAMI -h $LOCALHOST -p $PORT2 \
+    -D "cn=Babs,ou=Information Technology DivisioN,ou=People,$BASEDN" \
+    -w bjensen
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+test $KILLSERVERS != no && kill -HUP $KILLPIDS
+
+echo ">>>>> Test succeeded"
+
+test $KILLSERVERS != no && wait
+
+exit 0
diff --git a/tests/data/regressions/its8427/its8427-2 b/tests/data/regressions/its8427/its8427-2
new file mode 100755
index 0000000000..6f245c8fdb
--- /dev/null
+++ b/tests/data/regressions/its8427/its8427-2
@@ -0,0 +1,395 @@
+#! /bin/sh
+# $OpenLDAP$
+## This work is part of OpenLDAP Software <http://www.openldap.org/>.
+##
+## Copyright 1998-2019 The OpenLDAP Foundation.
+## All rights reserved.
+##
+## Redistribution and use in source and binary forms, with or without
+## modification, are permitted only as authorized by the OpenLDAP
+## Public License.
+##
+## A copy of this license is available in the file LICENSE in the
+## top-level directory of the distribution or, alternatively, at
+## <http://www.OpenLDAP.org/license.html>.
+
+echo "running defines.sh"
+. $SRCDIR/scripts/defines.sh
+
+if test $WITH_TLS = no ; then
+    echo "TLS support not available, test skipped"
+    exit 0
+fi
+
+if test $BACKLDAP = "ldapno" ; then
+    echo "LDAP backend not available, test skipped"
+    exit 0
+fi
+
+if test "$BACKEND" = "ldap"; then
+    echo "LDAP backend not valid, test skipped"
+    exit 0
+fi
+
+mkdir -p $TESTDIR $DBDIR1
+cp -r $DATADIR/tls $TESTDIR
+
+$SLAPPASSWD -g -n >$CONFIGPWF
+echo "rootpw `$SLAPPASSWD -T $CONFIGPWF`" >$TESTDIR/configpw.conf
+
+ITS=8427
+ITSDIR=$DATADIR/regressions/its$ITS
+
+echo "Running slapadd to build slapd database..."
+. $CONFFILTER $BACKEND $MONITORDB < $TLSCONF > $CONF1
+$SLAPADD -f $CONF1 -l $LDIFORDERED
+RC=$?
+if test $RC != 0 ; then
+    echo "slapadd failed ($RC)!"
+    exit $RC
+fi
+
+echo "database config" >> $CONF1
+echo "include $TESTDIR/configpw.conf" >> $CONF1
+
+echo "Starting slapd listening on $URIP1 and $SURIP2..."
+$SLAPD -f $CONF1 -h "$URIP1 $SURIP2" -d $LVL $TIMING > $LOG1 2>&1 &
+SERVERPID=$!
+if test $WAIT != 0 ; then
+    echo SERVERPID $SERVERPID
+    read foo
+fi
+KILLPIDS="$SERVERPID"
+
+sleep 1
+
+echo "Using ldapsearch to check that slapd is running..."
+for i in 0 1 2 3 4 5; do
+    $LDAPSEARCH -s base -b "$MONITOR" -h $LOCALHOST -p $PORT1 \
+        'objectclass=*' > /dev/null 2>&1
+    RC=$?
+    if test $RC = 0 ; then
+        break
+    fi
+    echo "Waiting 5 seconds for slapd to start..."
+    sleep 5
+done
+
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "database config" >> $CONF2
+echo "include $TESTDIR/configpw.conf" >> $CONF2
+
+echo "Starting proxy slapd on TCP/IP port $PORT3..."
+. $CONFFILTER $BACKEND $MONITORDB < $ITSDIR/slapd.conf > $CONF2
+$SLAPD -f $CONF2 -h $URI3 -d $LVL $TIMING > $LOG2 2>&1 &
+PROXYPID=$!
+if test $WAIT != 0 ; then
+    echo PROXYPID $PROXYPID
+    read foo
+fi
+KILLPIDS="$KILLPIDS $PROXYPID"
+
+sleep 1
+
+echo "Using ldapsearch to check that proxy slapd is running..."
+for i in 0 1 2 3 4 5; do
+    $LDAPSEARCH -s base -b "$MONITOR" -h $LOCALHOST -p $PORT3 \
+        'objectclass=*' > /dev/null 2>&1
+    RC=$?
+    if test $RC = 0 ; then
+        break
+    fi
+    echo "Waiting 5 seconds for slapd to start..."
+    sleep 5
+done
+
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Configuring proxy..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT3 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={2}ldap,cn=config
+changetype: add
+objectClass: olcLDAPConfig
+olcDbUri: $URI1
+olcSuffix: $BASEDN
+olcRootDN: $MANAGERDN
+olcRootPW: $PASSWD
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Privileged WhoAmI (proxy uses plain ldap://)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$MANAGERDN" -w $PASSWD
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "WhoAmI (proxy uses plain ldap://)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$BABSDN" -w bjensen
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Searching (proxy uses plain ldap://)..."
+echo "# Searching (proxy uses plain ldap://)..." > $SEARCHOUT
+$LDAPSEARCH -b "$BASEDN" -h $LOCALHOST -p $PORT3 \
+    -D "$BABSDN" -w bjensen \
+    '(objectClass=*)' >> $SEARCHOUT 2>&1
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Filtering ldapsearch results..."
+$LDIFFILTER < $SEARCHOUT > $SEARCHFLT
+echo "Filtering original ldif used to create database..."
+$LDIFFILTER < $LDIFORDERED > $LDIFFLT
+echo "" >> $LDIFFLT
+echo "Comparing filter output..."
+$CMP $SEARCHFLT $LDIFFLT > $CMPOUT
+
+if test $? != 0 ; then
+    echo "Comparison failed"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+fi
+
+echo "Reconfiguring database to only allow TLS binds..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT1 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={1}$BACKEND,cn=config
+changetype: modify
+add: olcAccess
+olcAccess: to attrs=userPassword by anonymous ssf=2 auth by users read
+olcAccess: to * by users read
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Re-configuring proxy to use ldaps:// on privileged connections only..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT3 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={2}ldap,cn=config
+changetype: delete
+
+dn: olcDatabase={2}ldap,cn=config
+changetype: add
+objectClass: olcLDAPConfig
+olcDbUri: $SURIP2
+olcSuffix: $BASEDN
+olcRootDN: $MANAGERDN
+olcRootPW: $PASSWD
+olcDbIDAssertBind: bindmethod=simple binddn="$MANAGERDN" credentials="$PASSWD" tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Privileged WhoAmI (proxy uses ldaps://)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$MANAGERDN" -w $PASSWD
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "WhoAmI (proxy uses ldaps://), which should fail..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$BABSDN" -w bjensen
+RC=$?
+case $RC in
+52)
+    ;;
+0)
+    echo "ldapwhoami should have failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+    ;;
+*)
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+    ;;
+esac
+
+# FIXME: just adding olcDbStartTLS to the DB doesn't have an effect, why?
+echo "Re-configuring proxy to use ldaps:// everywhere..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT3 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={2}ldap,cn=config
+changetype: modify
+add: olcDbStartTLS
+olcDbStartTLS: ldaps tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "WhoAmI again (proxy uses ldaps://)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$BABSDN" -w bjensen
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Searching (proxy uses ldaps://)..."
+echo "# Searching (proxy uses ldaps://)..." > $SEARCHOUT
+$LDAPSEARCH -b "$BASEDN" -h $LOCALHOST -p $PORT3 \
+    -D "$BABSDN" -w bjensen \
+    '(objectClass=*)' >> $SEARCHOUT 2>&1
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Filtering ldapsearch results..."
+$LDIFFILTER < $SEARCHOUT > $SEARCHFLT
+echo "Comparing filter output..."
+$CMP $SEARCHFLT $LDIFFLT > $CMPOUT
+
+if test $? != 0 ; then
+    echo "Comparison failed"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+fi
+
+echo "Re-configuring proxy to use LDAP+StartTLS correctly on privileged connections..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT3 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={2}ldap,cn=config
+changetype: delete
+
+dn: olcDatabase={2}ldap,cn=config
+changetype: add
+objectClass: olcLDAPConfig
+olcDbUri: $URIP1
+olcSuffix: $BASEDN
+olcRootDN: $MANAGERDN
+olcRootPW: $PASSWD
+olcDbIDAssertBind: bindmethod=none tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Privileged WhoAmI (proxy requests StartTLS)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$MANAGERDN" -w $PASSWD
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "WhoAmI (proxy requests StartTLS), which should fail..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$BABSDN" -w bjensen
+RC=$?
+case $RC in
+49|52) # ACL forbids plaintext binds against userPassword
+    ;;
+0)
+    echo "ldapwhoami should have failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+    ;;
+*)
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+    ;;
+esac
+
+# FIXME: just adding olcDbStartTLS to the DB doesn't have an effect, why?
+echo "Re-configuring proxy to use ldaps:// everywhere..."
+$LDAPMODIFY -D cn=config -h $LOCALHOST -p $PORT3 -y $CONFIGPWF \
+    > $TESTOUT 2>&1 <<EOF
+dn: olcDatabase={2}ldap,cn=config
+changetype: modify
+add: olcDbStartTLS
+olcDbStartTLS: start tls_cacert=$TESTDIR/tls/ca/certs/testsuiteCA.crt
+EOF
+RC=$?
+if test $RC != 0 ; then
+    echo "modification failed ($RC)"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "WhoAmI (proxy requests StartTLS)..."
+$LDAPWHOAMI -h $LOCALHOST -p $PORT3 -D "$BABSDN" -w bjensen
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapwhoami failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Searching (proxy requests StartTLS)..."
+echo "# Searching (proxy requests StartTLS)..." > $SEARCHOUT
+$LDAPSEARCH -b "$BASEDN" -h $LOCALHOST -p $PORT3 \
+    -D "$BABSDN" -w bjensen \
+    '(objectClass=*)' >> $SEARCHOUT 2>&1
+RC=$?
+if test $RC != 0 ; then
+    echo "ldapsearch failed ($RC)!"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit $RC
+fi
+
+echo "Filtering ldapsearch results..."
+$LDIFFILTER < $SEARCHOUT > $SEARCHFLT
+echo "Comparing filter output..."
+$CMP $SEARCHFLT $LDIFFLT > $CMPOUT
+
+if test $? != 0 ; then
+    echo "Comparison failed"
+    test $KILLSERVERS != no && kill -HUP $KILLPIDS
+    exit 1
+fi
+
+test $KILLSERVERS != no && kill -HUP $KILLPIDS
+
+echo ">>>>> Test succeeded"
+
+test $KILLSERVERS != no && wait
+
+exit 0
diff --git a/tests/data/regressions/its8427/slapd.conf b/tests/data/regressions/its8427/slapd.conf
new file mode 100644
index 0000000000..18dd9c0917
--- /dev/null
+++ b/tests/data/regressions/its8427/slapd.conf
@@ -0,0 +1,34 @@
+# stand-alone slapd config -- for testing (with indexing)
+# $OpenLDAP$
+## This work is part of OpenLDAP Software <http://www.openldap.org/>.
+##
+## Copyright 1998-2019 The OpenLDAP Foundation.
+## All rights reserved.
+##
+## Redistribution and use in source and binary forms, with or without
+## modification, are permitted only as authorized by the OpenLDAP
+## Public License.
+##
+## A copy of this license is available in the file LICENSE in the
+## top-level directory of the distribution or, alternatively, at
+## <http://www.OpenLDAP.org/license.html>.
+
+include		@SCHEMADIR@/core.schema
+include		@SCHEMADIR@/cosine.schema
+include		@SCHEMADIR@/inetorgperson.schema
+include		@SCHEMADIR@/openldap.schema
+include		@SCHEMADIR@/nis.schema
+
+pidfile		@TESTDIR@/slapd.2.pid
+argsfile	@TESTDIR@/slapd.2.args
+
+#ldapmod#modulepath ../servers/slapd/back-ldap/
+#ldapmod#moduleload back_ldap.la
+
+#monitormod#modulepath ../servers/slapd/back-monitor/
+#monitormod#moduleload back_monitor.la
+
+#monitor#database	monitor
+
+database config
+include		@TESTDIR@/configpw.conf