diff -ur a/epoptes/ui/gui.py b/epoptes/ui/gui.py
--- a/epoptes/ui/gui.py	2016-02-24 17:51:21.399067155 +0530
+++ b/epoptes/ui/gui.py	2016-02-24 17:52:38.131067711 +0530
@@ -272,9 +272,9 @@
                 self.vncviewer = subprocess.Popen(['xvnc4viewer',
                     '-listen', str(self.vncviewerport)])
             # Support tigervnc on rpm distributions (LP: #1501747)
-            elif os.path.isfile('/usr/share/locale/de/LC_MESSAGES/tigervnc.mo'):
+            elif os.path.isfile('/usr/bin/vncviewer-tightvnc'):
                 self.vncviewer = subprocess.Popen(['vncviewer',
-                    '-listen', str(self.vncviewerport)])
+                    '-listen', str(self.vncviewerport-5500)])
             # The rest of the viewers, like tightvnc
             else:
                 self.vncviewer = subprocess.Popen(['vncviewer',