diff --git a/CHANGES b/CHANGES
index a55037ce89..829bb8dd55 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+3362.	[bug]		Setting some option values to 0 in named.conf
+			could trigger an assertion failure on startup.
+			[RT #27730]
+
 3361.	[bug]		"rndc signing -nsec3param" didn't work correctly
 			when salt was set to '-' (no salt). [RT #30099]
 			
diff --git a/bin/tests/system/checkconf/clean.sh b/bin/tests/system/checkconf/clean.sh
index 0e3c0e626b..94f09d9bc8 100644
--- a/bin/tests/system/checkconf/clean.sh
+++ b/bin/tests/system/checkconf/clean.sh
@@ -16,4 +16,4 @@
 
 # $Id: clean.sh,v 1.2 2011/05/07 05:55:17 each Exp $
 
-rm -f good.conf.in good.conf.out
+rm -f good.conf.in good.conf.out badzero.conf
diff --git a/bin/tests/system/checkconf/tests.sh b/bin/tests/system/checkconf/tests.sh
index 5298852279..795ab56d57 100644
--- a/bin/tests/system/checkconf/tests.sh
+++ b/bin/tests/system/checkconf/tests.sh
@@ -57,5 +57,35 @@ $CHECKCONF dnssec.3 2>&1 | grep '.*' && ret=1
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+echo "I: range checking fields that do not allow zero"
+ret=0
+for field in max-retry-time min-retry-time max-refresh-time min-refresh-time; do
+    cat > badzero.conf << EOF
+options {
+    $field 0;
+};
+EOF
+    $CHECKCONF badzero.conf > /dev/null 2>&1
+    [ $? -eq 1 ] || { echo "I: options $field failed" ; ret=1; }
+    cat > badzero.conf << EOF
+view dummy {
+    $field 0;
+};
+EOF
+    $CHECKCONF badzero.conf > /dev/null 2>&1
+    [ $? -eq 1 ] || { echo "I: view $field failed" ; ret=1; }
+    cat > badzero.conf << EOF
+zone dummy {
+    type slave;
+    masters { 0.0.0.0; };
+    $field 0;
+};
+EOF
+    $CHECKCONF badzero.conf > /dev/null 2>&1
+    [ $? -eq 1 ] || { echo "I: zone $field failed" ; ret=1; }
+done
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
 echo "I:exit status: $status"
 exit $status
diff --git a/lib/bind9/check.c b/lib/bind9/check.c
index 85a0cd1190..277e9b3a1b 100644
--- a/lib/bind9/check.c
+++ b/lib/bind9/check.c
@@ -1294,6 +1294,29 @@ typedef struct {
 	int allowed;
 } optionstable;
 
+static isc_result_t
+check_nonzero(const cfg_obj_t *options, isc_log_t *logctx) {
+	isc_result_t result = ISC_R_SUCCESS;
+	const cfg_obj_t *obj = NULL;
+	unsigned int i;
+
+	static const char *nonzero[] = { "max-retry-time", "min-retry-time",
+				 "max-refresh-time", "min-refresh-time" };
+	/*
+	 * Check if value is zero.
+	 */
+	for (i = 0; i < sizeof(nonzero) / sizeof(nonzero[0]); i++) {
+		obj = NULL;
+		if (cfg_map_get(options, nonzero[i], &obj) == ISC_R_SUCCESS &&
+		    cfg_obj_asuint32(obj) == 0) {
+			cfg_obj_log(obj, logctx, ISC_LOG_ERROR,
+				    "'%s' must not be zero", nonzero[i]);
+			result = ISC_R_FAILURE;
+		}
+	}
+	return (result);
+}
+
 static isc_result_t
 check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions,
 	       const cfg_obj_t *config, isc_symtab_t *symtab,
@@ -1303,7 +1326,7 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions,
 	const char *znamestr;
 	const char *typestr;
 	unsigned int ztype;
-	const cfg_obj_t *zoptions;
+	const cfg_obj_t *zoptions, *goptions = NULL;
 	const cfg_obj_t *obj = NULL;
 	isc_result_t result = ISC_R_SUCCESS;
 	isc_result_t tresult;
@@ -1384,10 +1407,14 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions,
 	{ "passive", SLAVEZONE | STUBZONE | STREDIRECTZONE },
 	};
 
+
 	znamestr = cfg_obj_asstring(cfg_tuple_get(zconfig, "name"));
 
 	zoptions = cfg_tuple_get(zconfig, "options");
 
+	if (config != NULL)
+		cfg_map_get(config, "options", &goptions);
+
 	obj = NULL;
 	(void)cfg_map_get(zoptions, "type", &obj);
 	if (obj == NULL) {
@@ -1476,6 +1503,12 @@ check_zoneconf(const cfg_obj_t *zconfig, const cfg_obj_t *voptions,
 			root = ISC_TRUE;
 	}
 
+	/*
+	 * Check if value is zero.
+	 */
+	if (check_nonzero(zoptions, logctx) != ISC_R_SUCCESS)
+		result = ISC_R_FAILURE;
+
 	/*
 	 * Look for inappropriate options for the given zone type.
 	 * Check that ACLs expand correctly.
@@ -2214,13 +2247,18 @@ check_viewconf(const cfg_obj_t *config, const cfg_obj_t *voptions,
 	 * Check that forwarding is reasonable.
 	 */
 	if (voptions == NULL) {
-		if (options != NULL)
+		if (options != NULL) {
 			if (check_forward(options, NULL,
 					  logctx) != ISC_R_SUCCESS)
 				result = ISC_R_FAILURE;
+			if (check_nonzero(options, logctx) != ISC_R_SUCCESS)
+				result = ISC_R_FAILURE;
+		}
 	} else {
 		if (check_forward(voptions, NULL, logctx) != ISC_R_SUCCESS)
 			result = ISC_R_FAILURE;
+		if (check_nonzero(voptions, logctx) != ISC_R_SUCCESS)
+			result = ISC_R_FAILURE;
 	}
 
 	/*