diff --git a/rhodecode/lib/exceptions.py b/rhodecode/lib/exceptions.py
--- a/rhodecode/lib/exceptions.py
+++ b/rhodecode/lib/exceptions.py
@@ -23,6 +23,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from webob.exc import HTTPClientError
+
 
 class LdapUsernameError(Exception):
     pass
@@ -53,4 +55,17 @@ class UsersGroupsAssignedException(Excep
 
 
 class StatusChangeOnClosedPullRequestError(Exception):
-    pass
\ No newline at end of file
+    pass
+
+
+class HTTPLockedRC(HTTPClientError):
+    """
+    Special Exception For locked Repos in RhodeCode
+    """
+    code = 423
+    title = explanation = 'Repository Locked'
+
+    def __init__(self, reponame, username, *args, **kwargs):
+        self.title = self.explanation = ('Repository `%s` locked by '
+                                         'user `%s`' % (reponame, username))
+        super(HTTPLockedRC, self).__init__(*args, **kwargs)