diff --git a/pkg/api/validation/validation.go b/pkg/api/validation/validation.go
index 2a5445b75c7..5c14b83d43b 100644
--- a/pkg/api/validation/validation.go
+++ b/pkg/api/validation/validation.go
@@ -610,7 +610,7 @@ func validatePorts(ports []api.ContainerPort) errs.ValidationErrorList {
 		}
 		if len(port.Protocol) == 0 {
 			pErrs = append(pErrs, errs.NewFieldRequired("protocol"))
-		} else if !supportedPortProtocols.Has(strings.ToUpper(string(port.Protocol))) {
+		} else if !supportedPortProtocols.Has(string(port.Protocol)) {
 			pErrs = append(pErrs, errs.NewFieldNotSupported("protocol", port.Protocol))
 		}
 		allErrs = append(allErrs, pErrs.PrefixIndex(i)...)
@@ -1144,7 +1144,7 @@ func validateServicePort(sp *api.ServicePort, requireName bool, allNames *util.S
 
 	if len(sp.Protocol) == 0 {
 		allErrs = append(allErrs, errs.NewFieldRequired("protocol"))
-	} else if !supportedPortProtocols.Has(strings.ToUpper(string(sp.Protocol))) {
+	} else if !supportedPortProtocols.Has(string(sp.Protocol)) {
 		allErrs = append(allErrs, errs.NewFieldNotSupported("protocol", sp.Protocol))
 	}
 
@@ -1680,7 +1680,7 @@ func validateEndpointPort(port *api.EndpointPort, requireName bool) errs.Validat
 	}
 	if len(port.Protocol) == 0 {
 		allErrs = append(allErrs, errs.NewFieldRequired("protocol"))
-	} else if !supportedPortProtocols.Has(strings.ToUpper(string(port.Protocol))) {
+	} else if !supportedPortProtocols.Has(string(port.Protocol)) {
 		allErrs = append(allErrs, errs.NewFieldNotSupported("protocol", port.Protocol))
 	}
 	return allErrs
diff --git a/pkg/api/validation/validation_test.go b/pkg/api/validation/validation_test.go
index ea841e5680b..9ba9a0f14f1 100644
--- a/pkg/api/validation/validation_test.go
+++ b/pkg/api/validation/validation_test.go
@@ -493,7 +493,6 @@ func TestValidatePorts(t *testing.T) {
 		{Name: "easy", ContainerPort: 82, Protocol: "TCP"},
 		{Name: "as", ContainerPort: 83, Protocol: "UDP"},
 		{Name: "do-re-me", ContainerPort: 84, Protocol: "UDP"},
-		{Name: "baby-you-and-me", ContainerPort: 82, Protocol: "tcp"},
 		{ContainerPort: 85, Protocol: "TCP"},
 	}
 	if errs := validatePorts(successCase); len(errs) != 0 {
@@ -522,6 +521,7 @@ func TestValidatePorts(t *testing.T) {
 		"zero container port":    {[]api.ContainerPort{{ContainerPort: 0, Protocol: "TCP"}}, errors.ValidationErrorTypeInvalid, "[0].containerPort", portRangeErrorMsg},
 		"invalid container port": {[]api.ContainerPort{{ContainerPort: 65536, Protocol: "TCP"}}, errors.ValidationErrorTypeInvalid, "[0].containerPort", portRangeErrorMsg},
 		"invalid host port":      {[]api.ContainerPort{{ContainerPort: 80, HostPort: 65536, Protocol: "TCP"}}, errors.ValidationErrorTypeInvalid, "[0].hostPort", portRangeErrorMsg},
+		"invalid protocol case":  {[]api.ContainerPort{{ContainerPort: 80, Protocol: "tcp"}}, errors.ValidationErrorTypeNotSupported, "[0].protocol", ""},
 		"invalid protocol":       {[]api.ContainerPort{{ContainerPort: 80, Protocol: "ICMP"}}, errors.ValidationErrorTypeNotSupported, "[0].protocol", ""},
 		"protocol required":      {[]api.ContainerPort{{Name: "abc", ContainerPort: 80}}, errors.ValidationErrorTypeRequired, "[0].protocol", ""},
 	}
diff --git a/test/e2e/dns.go b/test/e2e/dns.go
index f527f39f9db..3c941995770 100644
--- a/test/e2e/dns.go
+++ b/test/e2e/dns.go
@@ -18,6 +18,9 @@ package e2e
 
 import (
 	"fmt"
+	"strings"
+	"time"
+
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
@@ -25,8 +28,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/wait"
-	"strings"
-	"time"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -237,7 +238,7 @@ var _ = Describe("DNS", func() {
 			Spec: api.ServiceSpec{
 				ClusterIP: "None",
 				Ports: []api.ServicePort{
-					{Port: 80, Name: "http", Protocol: "tcp"},
+					{Port: 80, Name: "http", Protocol: "TCP"},
 				},
 				Selector: testServiceSelector,
 			},
@@ -257,7 +258,7 @@ var _ = Describe("DNS", func() {
 			},
 			Spec: api.ServiceSpec{
 				Ports: []api.ServicePort{
-					{Port: 80, Name: "http", Protocol: "tcp"},
+					{Port: 80, Name: "http", Protocol: "TCP"},
 				},
 				Selector: testServiceSelector,
 			},