--- a/base/univention-config-registry/python/univention/service_info.py	
+++ a/base/univention-config-registry/python/univention/service_info.py	
@@ -65,10 +65,11 @@ def pidof( name ):
 		if not os.path.isfile( os.path.join( dir, 'stat' ) ):
 			continue
 		cmdline = os.path.join( dir, 'cmdline' )
-		if not os.path.isfile( cmdline ):
+		try:
+			with open(cmdline) as fd:
+				cmd = fd.readline()
+		except (IOError, OSError):
 			continue
-		fd = open( cmdline )
-		cmd = fd.readline()
 		# kernel thread
 		if not cmd:
 			continue