ACL error Permit / Deny

Our softphones are not registering at our Freepbx. we are receiving a "Registration Error 404".
The server error is : ACL error (permit/deny) Registration from '"3702"' failed for 'XXX.XXX.XX.XXX' - ACL error (permit/deny)
Our server has been working from along 1.5 years, and suddenly it is not registering the softphone extensions.
Any ideas, would be very very appreciated.
Thanks in advance.
Guillermo Sanchez.
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This is an Asterisk/FreePBX
This is an Asterisk/FreePBX v2 question - please try that forum.
Darren Schreiber
Co-Founder - 2600hz Project - www.2600hz.org
(Formerly Lead Developer, FreePBX v3)