diff --git a/Deploy/templates/registry/config.yml b/Deploy/templates/registry/config.yml
index 999488a95..faabe10cd 100644
--- a/Deploy/templates/registry/config.yml
+++ b/Deploy/templates/registry/config.yml
@@ -30,6 +30,6 @@ notifications:
       - name: harbor
         disabled: false
         url: http://ui/service/notifications
-        timeout: 500ms
+        timeout: 3000ms
         threshold: 5
         backoff: 1s
diff --git a/api/replication_job.go b/api/replication_job.go
index bc1fced44..95f795194 100644
--- a/api/replication_job.go
+++ b/api/replication_job.go
@@ -127,6 +127,10 @@ func (ra *RepJobAPI) Delete() {
 		ra.CustomAbort(http.StatusInternalServerError, http.StatusText(http.StatusInternalServerError))
 	}
 
+	if job == nil {
+		ra.CustomAbort(http.StatusNotFound, fmt.Sprintf("job %d not found", ra.jobID))
+	}
+
 	if job.Status == models.JobPending || job.Status == models.JobRunning {
 		ra.CustomAbort(http.StatusBadRequest, fmt.Sprintf("job is %s, can not be deleted", job.Status))
 	}
diff --git a/api/repository.go b/api/repository.go
index 84d4ac286..e14eda423 100644
--- a/api/repository.go
+++ b/api/repository.go
@@ -222,6 +222,10 @@ func (ra *RepositoryAPI) GetTags() {
 		ra.CustomAbort(http.StatusInternalServerError, "")
 	}
 
+	if project == nil {
+		ra.CustomAbort(http.StatusNotFound, fmt.Sprintf("project %s not found", projectName))
+	}
+
 	if project.Public == 0 {
 		userID := ra.ValidateUser()
 		if !checkProjectPermission(userID, project.ProjectID) {
diff --git a/controllers/base.go b/controllers/base.go
index bd9a23bf7..bd3171926 100644
--- a/controllers/base.go
+++ b/controllers/base.go
@@ -107,6 +107,12 @@ func (b *BaseController) Prepare() {
 	if _, err := os.Stat(filepath.Join("static", "resources", "js", "harbor.app.min.js")); os.IsNotExist(err) {
 		b.UseCompressedJS = false
 	}
+
+	selfRegistration := strings.ToLower(os.Getenv("SELF_REGISTRATION"))
+	if selfRegistration == "on" {
+		b.SelfRegistration = true
+	}
+	b.Data["SelfRegistration"] = b.SelfRegistration
 }
 
 // Forward to setup layout and template for content for a page.
diff --git a/controllers/signup.go b/controllers/signup.go
index 9d46a368b..6ed75b01b 100644
--- a/controllers/signup.go
+++ b/controllers/signup.go
@@ -11,7 +11,7 @@ type SignUpController struct {
 
 // Get renders sign up page
 func (suc *SignUpController) Get() {
-	if suc.AuthMode != "db_auth" {
+	if suc.AuthMode != "db_auth" || !suc.SelfRegistration {
 		suc.CustomAbort(http.StatusUnauthorized, "Status unauthorized.")
 	}
 	suc.Data["AddNew"] = false
diff --git a/dao/accesslog.go b/dao/accesslog.go
index b76a40072..7d268f10f 100644
--- a/dao/accesslog.go
+++ b/dao/accesslog.go
@@ -195,7 +195,7 @@ func GetTopRepos(countNum int) ([]models.TopRepo, error) {
 	for i := 0; i < len(list); i++ {
 		for _, v := range usrnameList {
 			if v.RepoName == list[i].RepoName {
-				list[i].Creator = v.Creator
+				//			list[i].Creator = v.Creator
 				break
 			}
 		}
diff --git a/dao/dao_test.go b/dao/dao_test.go
index 52ea37a27..5dccc51ea 100644
--- a/dao/dao_test.go
+++ b/dao/dao_test.go
@@ -770,9 +770,11 @@ func TestGetTopRepos(t *testing.T) {
 	if topRepos[0].AccessCount != 1 {
 		t.Errorf("error occured in get top reop's access count, expected: %v, actual: %v", 1, topRepos[0].AccessCount)
 	}
-	if topRepos[0].Creator != currentUser.Username {
-		t.Errorf("error occured in get top reop's creator, expected: %v, actual: %v", currentUser.Username, topRepos[0].Creator)
-	}
+	/*
+		if topRepos[0].Creator != currentUser.Username {
+			t.Errorf("error occured in get top reop's creator, expected: %v, actual: %v", currentUser.Username, topRepos[0].Creator)
+		}
+	*/
 	err = ToggleProjectPublicity(currentProject.ProjectID, publicityOff)
 	if err != nil {
 		t.Errorf("Error occurred in ToggleProjectPublicity: %v", err)
diff --git a/models/toprepo.go b/models/toprepo.go
index 6ccb46227..b977e4c18 100644
--- a/models/toprepo.go
+++ b/models/toprepo.go
@@ -19,5 +19,5 @@ package models
 type TopRepo struct {
 	RepoName    string `json:"name"`
 	AccessCount int64  `json:"count"`
-	Creator     string `json:"creator"`
+	//	Creator     string `json:"creator"`
 }
diff --git a/static/resources/js/components/top-repository/top-repository.directive.html b/static/resources/js/components/top-repository/top-repository.directive.html
index c45a7adfa..a44c1dc93 100644
--- a/static/resources/js/components/top-repository/top-repository.directive.html
+++ b/static/resources/js/components/top-repository/top-repository.directive.html
@@ -18,8 +18,7 @@
     <table class="table table-pane table-header">
       <thead>
         <th width="60%">// 'repository_name' | tr //</th>
-        <th width="15%">// 'count' | tr //</th>
-        <th width="25%">// 'creator' | tr //</th>
+        <th width="40%">// 'count' | tr //</th>
       </thead>
     </table>
   </div>
@@ -30,7 +29,7 @@
           <td colspan="5" height="120px" class="empty-hint" ng-if="vm.top10Repositories.length === 0"><h4 class="text-muted">// 'no_top_repositories' | tr //</h4></td>
         </tr>
         <tr ng-if="vm.top10Repositories.length > 0" ng-repeat="t in vm.top10Repositories">
-          <td width="60%">//t.name//</td><td width="15%">//t.count//</td><td width="25%">//t.creator === '' ? '-' : t.creator //</td>
+          <td width="60%">//t.name//</td><td width="40%">//t.count//</td>
         </tr>
       </tbody>
     </table>
diff --git a/views/sign-in.htm b/views/sign-in.htm
index a4bd94975..3d0e551a0 100644
--- a/views/sign-in.htm
+++ b/views/sign-in.htm
@@ -46,7 +46,7 @@
     <div class="col-sm-offset-1 col-sm-10">
       <div class="pull-right">
         <button type="submit" class="btn btn-default" ng-click="vm.doSignIn(user)" loading-progress hide-target="false" toggle-in-progress="vm.signInTIP">// 'sign_in' | tr //</button>
-        {{ if eq .AuthMode "db_auth" }}
+        {{ if and (eq .AuthMode "db_auth") (eq .SelfRegistration true) }}
         <button type="button" class="btn btn-success" ng-click="vm.doSignUp()">// 'sign_up' | tr //</button>   
         {{ end }}
       </div>