diff --git a/cli/azd/internal/cmd/add/add_configure_host.go b/cli/azd/internal/cmd/add/add_configure_host.go
index f2b148a3744..367584d9c57 100644
--- a/cli/azd/internal/cmd/add/add_configure_host.go
+++ b/cli/azd/internal/cmd/add/add_configure_host.go
@@ -238,7 +238,7 @@ func addServiceAsResource(
 		if _, err := os.Stat(filepath.Join(svc.RelativePath, "Dockerfile")); errors.Is(err, os.ErrNotExist) {
 			// default builder always specifies port 80
 			props.Port = 80
-			if svc.Language == project.ServiceLanguageJava {
+			if svc.Language == project.ServiceLanguageJava || svc.Language.IsDotNet() {
 				props.Port = 8080
 			}
 		}
diff --git a/cli/azd/internal/repository/app_init_test.go b/cli/azd/internal/repository/app_init_test.go
index 37652ea84e7..6a0b7a7dac6 100644
--- a/cli/azd/internal/repository/app_init_test.go
+++ b/cli/azd/internal/repository/app_init_test.go
@@ -46,7 +46,7 @@ func TestInitializer_prjConfigFromDetect(t *testing.T) {
 						Type: project.ResourceTypeHostContainerApp,
 						Name: "dotnet",
 						Props: project.ContainerAppProps{
-							Port: 80,
+							Port: 8080,
 						},
 					},
 				},
diff --git a/cli/azd/internal/repository/infra_confirm.go b/cli/azd/internal/repository/infra_confirm.go
index 6cea992dea6..ee5a50f716b 100644
--- a/cli/azd/internal/repository/infra_confirm.go
+++ b/cli/azd/internal/repository/infra_confirm.go
@@ -212,7 +212,7 @@ func PromptPort(
 	name string,
 	svc appdetect.Project) (int, error) {
 	if svc.Docker == nil || svc.Docker.Path == "" { // using default builder from azd
-		if svc.Language == appdetect.Java {
+		if svc.Language == appdetect.Java || svc.Language == appdetect.DotNet {
 			return 8080, nil
 		}
 		return 80, nil
diff --git a/cli/azd/internal/repository/infra_confirm_test.go b/cli/azd/internal/repository/infra_confirm_test.go
index 98fcfe90ab7..7ccfdfeab25 100644
--- a/cli/azd/internal/repository/infra_confirm_test.go
+++ b/cli/azd/internal/repository/infra_confirm_test.go
@@ -35,7 +35,7 @@ func TestInitializer_infraSpecFromDetect(t *testing.T) {
 				Services: []scaffold.ServiceSpec{
 					{
 						Name:    "dotnet",
-						Port:    80,
+						Port:    8080,
 						Backend: &scaffold.Backend{},
 					},
 				},