@@ -6,6 +6,7 @@ import (

 	"fmt"

 	"io"

 	"io/ioutil"

+	"net/url"

 	"os"

 	"runtime"

@@ -17,6 +18,7 @@ import (

 	"github.com/docker/distribution/manifest/schema2"

 	"github.com/docker/distribution/registry/api/errcode"

 	"github.com/docker/distribution/registry/client"

+	"github.com/docker/distribution/registry/client/auth"

 	"github.com/docker/distribution/registry/client/transport"

 	"github.com/docker/docker/distribution/metadata"

 	"github.com/docker/docker/distribution/xfer"

@@ -710,6 +712,10 @@ func allowV1Fallback(err error) error {

 		if registry.ShouldV2Fallback(v) {

 			return fallbackError{err: err, confirmedV2: false}

 		}

+	case *url.Error:

+		if v.Err == auth.ErrNoBasicAuthCredentials {

+			return fallbackError{err: err, confirmedV2: false}

+		}

 	}

 	return err