deny/permit lines

Hello!
In the Extesions tab there were lines deny/permit. But the deny/permit lines have disappeared. What it could be?
Help please.
Thanks!
FreePBX 2.5.1.5
[root@elastix ~]# uname -a
Linux elastix.example.com 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 12:03:43 EST 2008 i686 i686 i386 GNU/Linux
[root@elastix ~]# asterisk -v
Asterisk 1.4.25.1, Copyright (C) 1999 - 2008 Digium, Inc. and others.
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If you click on an existing
If you click on an existing extension you will see them. They do not show up until the extension is created.
Mikael Carlsson
(I am off-line, tinkering with my Chevy and my radios, don't know when I will be back)