diff --git a/weed/pb/iam.proto b/weed/pb/iam.proto
index ddb4e5e5d..2eef22dd9 100644
--- a/weed/pb/iam.proto
+++ b/weed/pb/iam.proto
@@ -13,7 +13,7 @@ service SeaweedIdentityAccessManagement {
 
 //////////////////////////////////////////////////
 
-message Identities {
+message S3ApiConfiguration {
     repeated Identity identities = 1;
 }
 
diff --git a/weed/pb/iam_pb/iam.pb.go b/weed/pb/iam_pb/iam.pb.go
index 53cef9cc1..7f796677c 100644
--- a/weed/pb/iam_pb/iam.pb.go
+++ b/weed/pb/iam_pb/iam.pb.go
@@ -35,16 +35,16 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
 
-type Identities struct {
+type S3ApiConfiguration struct {
 	Identities []*Identity `protobuf:"bytes,1,rep,name=identities" json:"identities,omitempty"`
 }
 
-func (m *Identities) Reset()                    { *m = Identities{} }
-func (m *Identities) String() string            { return proto.CompactTextString(m) }
-func (*Identities) ProtoMessage()               {}
-func (*Identities) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+func (m *S3ApiConfiguration) Reset()                    { *m = S3ApiConfiguration{} }
+func (m *S3ApiConfiguration) String() string            { return proto.CompactTextString(m) }
+func (*S3ApiConfiguration) ProtoMessage()               {}
+func (*S3ApiConfiguration) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
 
-func (m *Identities) GetIdentities() []*Identity {
+func (m *S3ApiConfiguration) GetIdentities() []*Identity {
 	if m != nil {
 		return m.Identities
 	}
@@ -108,7 +108,7 @@ func (m *Credential) GetSecretKey() string {
 }
 
 func init() {
-	proto.RegisterType((*Identities)(nil), "iam_pb.Identities")
+	proto.RegisterType((*S3ApiConfiguration)(nil), "iam_pb.Identities")
 	proto.RegisterType((*Identity)(nil), "iam_pb.Identity")
 	proto.RegisterType((*Credential)(nil), "iam_pb.Credential")
 }
@@ -154,20 +154,21 @@ var _SeaweedIdentityAccessManagement_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("iam.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 238 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x4c, 0x90, 0xc1, 0x4a, 0xc3, 0x40,
-	0x10, 0x86, 0x49, 0x23, 0xb5, 0x99, 0x5e, 0xca, 0x9c, 0xf6, 0xa0, 0x18, 0x73, 0xca, 0x29, 0x48,
-	0xf5, 0x2c, 0xa8, 0xa7, 0x5a, 0x04, 0x89, 0x0f, 0x50, 0xa6, 0xdb, 0x51, 0x16, 0xbb, 0x9b, 0x92,
-	0x59, 0x90, 0xbc, 0xbd, 0x64, 0xb7, 0xdb, 0xf6, 0xb6, 0xf3, 0x7f, 0xdf, 0xcc, 0x32, 0x03, 0x85,
-	0x21, 0xdb, 0x1c, 0xfa, 0xce, 0x77, 0x38, 0x35, 0x64, 0x37, 0x87, 0x6d, 0xf5, 0x0c, 0xb0, 0xda,
-	0xb1, 0xf3, 0xc6, 0x1b, 0x16, 0x7c, 0x00, 0x30, 0xa7, 0x4a, 0x65, 0x65, 0x5e, 0xcf, 0x97, 0x8b,
-	0x26, 0xaa, 0xcd, 0xd1, 0x1b, 0xda, 0x0b, 0xa7, 0x72, 0x30, 0x4b, 0x39, 0x22, 0x5c, 0x39, 0xb2,
-	0xac, 0xb2, 0x32, 0xab, 0x8b, 0x36, 0xbc, 0xf1, 0x09, 0xe6, 0xba, 0xe7, 0x60, 0xd0, 0x5e, 0xd4,
-	0x24, 0x8c, 0xc4, 0x34, 0xf2, 0xed, 0x84, 0xda, 0x4b, 0x0d, 0x15, 0x5c, 0x93, 0xf6, 0xa6, 0x73,
-	0xa2, 0xf2, 0x32, 0xaf, 0x8b, 0x36, 0x95, 0xd5, 0x3b, 0xc0, 0xb9, 0x09, 0x6f, 0x01, 0x48, 0x6b,
-	0x16, 0xd9, 0xfc, 0xf2, 0x70, 0xfc, 0xb7, 0x88, 0xc9, 0x9a, 0x87, 0x11, 0x0b, 0xeb, 0x9e, 0x7d,
-	0xc0, 0x93, 0x88, 0x63, 0xb2, 0xe6, 0x61, 0x79, 0x0f, 0x77, 0x5f, 0x4c, 0x7f, 0xcc, 0xbb, 0xb4,
-	0xc2, 0x4b, 0x68, 0xfd, 0x20, 0x47, 0x3f, 0x6c, 0xd9, 0xf9, 0xd7, 0x1b, 0x58, 0x48, 0x54, 0xbe,
-	0xa5, 0xd1, 0x7b, 0x33, 0x66, 0xb3, 0x15, 0xd9, 0xcf, 0xf1, 0x88, 0xdb, 0x69, 0xb8, 0xe5, 0xe3,
-	0x7f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x65, 0xb9, 0x71, 0x4e, 0x58, 0x01, 0x00, 0x00,
+	// 250 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x4c, 0x90, 0x41, 0x4b, 0xc3, 0x40,
+	0x10, 0x85, 0x69, 0x23, 0xb5, 0x99, 0x5e, 0xca, 0x9c, 0xf6, 0xa0, 0x18, 0x73, 0xca, 0x29, 0x48,
+	0xeb, 0x1f, 0xa8, 0x05, 0xa1, 0x16, 0x41, 0xd2, 0x1f, 0x50, 0xa6, 0xdb, 0x69, 0x19, 0xec, 0x6e,
+	0x42, 0x76, 0x45, 0xf2, 0xef, 0x25, 0xbb, 0x46, 0x7b, 0xdb, 0x7d, 0xdf, 0x7b, 0xb3, 0x3b, 0x0f,
+	0x52, 0x21, 0x53, 0x36, 0x6d, 0xed, 0x6b, 0x9c, 0x08, 0x99, 0x7d, 0x73, 0xc8, 0x5f, 0x01, 0x77,
+	0xcb, 0x55, 0x23, 0xeb, 0xda, 0x9e, 0xe4, 0xfc, 0xd5, 0x92, 0x97, 0xda, 0xe2, 0x13, 0x80, 0x1c,
+	0xd9, 0x7a, 0xf1, 0xc2, 0x4e, 0x8d, 0xb2, 0xa4, 0x98, 0x2d, 0xe6, 0x65, 0x8c, 0x94, 0x9b, 0x48,
+	0xba, 0xea, 0xca, 0x93, 0x5b, 0x98, 0x0e, 0x3a, 0x22, 0xdc, 0x58, 0x32, 0xac, 0x46, 0xd9, 0xa8,
+	0x48, 0xab, 0x70, 0xc6, 0x67, 0x98, 0xe9, 0x96, 0x83, 0x83, 0x2e, 0x4e, 0x8d, 0xc3, 0x48, 0x1c,
+	0x46, 0xae, 0xff, 0x50, 0x75, 0x6d, 0x43, 0x05, 0xb7, 0xa4, 0xfb, 0x1f, 0x39, 0x95, 0x64, 0x49,
+	0x91, 0x56, 0xc3, 0x35, 0x7f, 0x03, 0xf8, 0x0f, 0xe1, 0x3d, 0x00, 0x69, 0xcd, 0xce, 0xed, 0x3f,
+	0xb9, 0xfb, 0x7d, 0x37, 0x8d, 0xca, 0x96, 0xbb, 0x1e, 0x3b, 0xd6, 0x2d, 0xfb, 0x80, 0xc7, 0x11,
+	0x47, 0x65, 0xcb, 0xdd, 0xe2, 0x11, 0x1e, 0x76, 0x4c, 0xdf, 0xcc, 0xc7, 0x61, 0x85, 0x55, 0x88,
+	0xbe, 0x93, 0xa5, 0x33, 0x1b, 0xb6, 0xfe, 0xe5, 0x0e, 0xe6, 0x2e, 0x5a, 0x4e, 0xae, 0xd4, 0x17,
+	0xe9, 0xb5, 0xe9, 0x86, 0xcc, 0x47, 0x5f, 0xe6, 0x61, 0x12, 0x3a, 0x5d, 0xfe, 0x04, 0x00, 0x00,
+	0xff, 0xff, 0x83, 0x4f, 0x61, 0x03, 0x60, 0x01, 0x00, 0x00,
 }
diff --git a/weed/s3api/auth_credentials.go b/weed/s3api/auth_credentials.go
index e5d693951..aa5199117 100644
--- a/weed/s3api/auth_credentials.go
+++ b/weed/s3api/auth_credentials.go
@@ -47,15 +47,15 @@ func NewIdentityAccessManagement(fileName string, domain string) *IdentityAccess
 	if fileName == "" {
 		return iam
 	}
-	if err := iam.loadIdentities(fileName); err != nil {
+	if err := iam.loadS3ApiConfiguration(fileName); err != nil {
 		glog.Fatalf("fail to load config file %s: %v", fileName, err)
 	}
 	return iam
 }
 
-func (iam *IdentityAccessManagement) loadIdentities(fileName string) error {
+func (iam *IdentityAccessManagement) loadS3ApiConfiguration(fileName string) error {
 
-	identities := &iam_pb.Identities{}
+	s3ApiConfiguration := &iam_pb.S3ApiConfiguration{}
 
 	rawData, readErr := ioutil.ReadFile(fileName)
 	if readErr != nil {
@@ -64,12 +64,12 @@ func (iam *IdentityAccessManagement) loadIdentities(fileName string) error {
 	}
 
 	glog.V(1).Infof("maybeLoadVolumeInfo Unmarshal volume info %v", fileName)
-	if err := jsonpb.Unmarshal(bytes.NewReader(rawData), identities); err != nil {
+	if err := jsonpb.Unmarshal(bytes.NewReader(rawData), s3ApiConfiguration); err != nil {
 		glog.Warningf("unmarshal error: %v", err)
 		return fmt.Errorf("unmarshal %s error: %v", fileName, err)
 	}
 
-	for _, ident := range identities.Identities {
+	for _, ident := range s3ApiConfiguration.Identities {
 		t := &Identity{
 			Name:        ident.Name,
 			Credentials: nil,
diff --git a/weed/s3api/auth_credentials_test.go b/weed/s3api/auth_credentials_test.go
index 5e605bdd5..c6f76560c 100644
--- a/weed/s3api/auth_credentials_test.go
+++ b/weed/s3api/auth_credentials_test.go
@@ -10,7 +10,7 @@ import (
 
 func TestIdentityListFileFormat(t *testing.T) {
 
-	identities := &iam_pb.Identities{}
+	s3ApiConfiguration := &iam_pb.S3ApiConfiguration{}
 
 	identity1 := &iam_pb.Identity{
 		Name: "some_name",
@@ -52,16 +52,16 @@ func TestIdentityListFileFormat(t *testing.T) {
 		},
 	}
 
-	identities.Identities = append(identities.Identities, identity1)
-	identities.Identities = append(identities.Identities, identity2)
-	identities.Identities = append(identities.Identities, identity3)
+	s3ApiConfiguration.Identities = append(s3ApiConfiguration.Identities, identity1)
+	s3ApiConfiguration.Identities = append(s3ApiConfiguration.Identities, identity2)
+	s3ApiConfiguration.Identities = append(s3ApiConfiguration.Identities, identity3)
 
 	m := jsonpb.Marshaler{
 		EmitDefaults: true,
 		Indent:       "  ",
 	}
 
-	text, _ := m.MarshalToString(identities)
+	text, _ := m.MarshalToString(s3ApiConfiguration)
 
 	println(text)