diff --git a/bin/tests/system/dnssec/ns4/named1.conf.in b/bin/tests/system/dnssec/ns4/named1.conf.in
index 9559a00c01..f772e8059e 100644
--- a/bin/tests/system/dnssec/ns4/named1.conf.in
+++ b/bin/tests/system/dnssec/ns4/named1.conf.in
@@ -37,6 +37,10 @@ options {
 	bindkeys-file "../../../../../bind.keys";
 };
 
+server 10.53.0.10 {
+	tcp-on-no-cookie false;
+};
+
 key rndc_key {
 	secret "1234abcd8765";
 	algorithm hmac-sha256;
diff --git a/bin/tests/system/dnssec/ns4/named2.conf.in b/bin/tests/system/dnssec/ns4/named2.conf.in
index f1ec362032..cc0c8df787 100644
--- a/bin/tests/system/dnssec/ns4/named2.conf.in
+++ b/bin/tests/system/dnssec/ns4/named2.conf.in
@@ -31,6 +31,10 @@ key rndc_key {
 	algorithm hmac-sha256;
 };
 
+server 10.53.0.10 {
+	tcp-on-no-cookie false;
+};
+
 controls {
 	inet 10.53.0.4 port @CONTROLPORT@ allow { any; } keys { rndc_key; };
 };
diff --git a/bin/tests/system/dnssec/ns4/named3.conf.in b/bin/tests/system/dnssec/ns4/named3.conf.in
index 097ed33de4..b8ea5f82c2 100644
--- a/bin/tests/system/dnssec/ns4/named3.conf.in
+++ b/bin/tests/system/dnssec/ns4/named3.conf.in
@@ -31,6 +31,10 @@ key rndc_key {
 	algorithm hmac-sha256;
 };
 
+server 10.53.0.10 {
+	tcp-on-no-cookie false;
+};
+
 controls {
 	inet 10.53.0.4 port @CONTROLPORT@ allow { any; } keys { rndc_key; };
 };
diff --git a/bin/tests/system/dnssec/ns4/named4.conf.in b/bin/tests/system/dnssec/ns4/named4.conf.in
index 6e5b40a830..717b51d26d 100644
--- a/bin/tests/system/dnssec/ns4/named4.conf.in
+++ b/bin/tests/system/dnssec/ns4/named4.conf.in
@@ -21,6 +21,10 @@ options {
 	listen-on-v6 { none; };
 };
 
+server 10.53.0.10 {
+	tcp-on-no-cookie false;
+};
+
 key rndc_key {
 	secret "1234abcd8765";
 	algorithm hmac-sha256;
diff --git a/bin/tests/system/dnssec/ns4/named5.conf.in b/bin/tests/system/dnssec/ns4/named5.conf.in
index 7ab0eb6946..cb5a4b3e7c 100644
--- a/bin/tests/system/dnssec/ns4/named5.conf.in
+++ b/bin/tests/system/dnssec/ns4/named5.conf.in
@@ -22,6 +22,10 @@ options {
 	bindkeys-file "managed.conf";
 };
 
+server 10.53.0.10 {
+	tcp-on-no-cookie false;
+};
+
 key rndc_key {
 	secret "1234abcd8765";
 	algorithm hmac-sha256;