diff --git a/server/configs/tls/tls-ed25519.conf b/server/configs/tls/tls-ed25519.conf
index 2f10f7dd..dcb8fd94 100644
--- a/server/configs/tls/tls-ed25519.conf
+++ b/server/configs/tls/tls-ed25519.conf
@@ -1,6 +1,6 @@
 # Simple TLS (ed25519) config file
 
-listen: 127.0.0.1:4443
+listen: 127.0.0.1:-1
 
 tls {
   cert_file:  "./configs/certs/tls/benchmark-server-cert-ed25519.pem"
diff --git a/server/configs/tls/tls-none.conf b/server/configs/tls/tls-none.conf
index c6cae62d..042bf4e0 100644
--- a/server/configs/tls/tls-none.conf
+++ b/server/configs/tls/tls-none.conf
@@ -1,4 +1,4 @@
 # Simple config file
 
-listen: 127.0.0.1:4443
+listen: 127.0.0.1:-1
 
diff --git a/server/configs/tls/tls-rsa-1024.conf b/server/configs/tls/tls-rsa-1024.conf
index a5032fda..fb3aaa41 100644
--- a/server/configs/tls/tls-rsa-1024.conf
+++ b/server/configs/tls/tls-rsa-1024.conf
@@ -1,6 +1,6 @@
 # Simple TLS (rsa-1024) config file
 
-listen: 127.0.0.1:4443
+listen: 127.0.0.1:-1
 
 tls {
   cert_file:  "./configs/certs/tls/benchmark-server-cert-rsa-1024.pem"
diff --git a/server/configs/tls/tls-rsa-2048.conf b/server/configs/tls/tls-rsa-2048.conf
index 9e33b7d8..08f54a25 100644
--- a/server/configs/tls/tls-rsa-2048.conf
+++ b/server/configs/tls/tls-rsa-2048.conf
@@ -1,6 +1,6 @@
 # Simple TLS (rsa-2048) config file
 
-listen: 127.0.0.1:4443
+listen: 127.0.0.1:-1
 
 tls {
   cert_file:  "./configs/certs/tls/benchmark-server-cert-rsa-2048.pem"
diff --git a/server/configs/tls/tls-rsa-4096.conf b/server/configs/tls/tls-rsa-4096.conf
index a64ede8f..68ad841b 100644
--- a/server/configs/tls/tls-rsa-4096.conf
+++ b/server/configs/tls/tls-rsa-4096.conf
@@ -1,6 +1,6 @@
 # Simple TLS (rsa-4096) config file
 
-listen: 127.0.0.1:4443
+listen: 127.0.0.1:-1
 
 tls {
   cert_file:  "./configs/certs/tls/benchmark-server-cert-rsa-4096.pem"
diff --git a/server/core_benchmarks_test.go b/server/core_benchmarks_test.go
index 560cd149..707d267b 100644
--- a/server/core_benchmarks_test.go
+++ b/server/core_benchmarks_test.go
@@ -54,9 +54,9 @@ func BenchmarkRequestReplyOverEncryptedConnection(b *testing.B) {
 
 					// run server with tls scheme
 					server, _ := RunServerWithConfig(schemeConfig)
-					opts := defaultOpts
 					defer server.Shutdown()
 
+					opts := defaultOpts
 					if keyType != "none" {
 						opts = append(opts, nats.Secure(&tls.Config{
 							InsecureSkipVerify: true,