Hi Guys, We recently made a new post on how to secure Asterisk ( or Elastix ) using a new portknocking technique. This new technique is easy to install by admins and doesn't require any configuration by the end-user, while still keeping your port 5060 ( or other port, if you changed your default SIP port ) closed. http://www.sunshinenetworks.com.au/how- ... knock.html I'd appreciate feedback and comments. Special note to Dicko : your input is greatly appreciated, if you have time to read the article and test this out, please let us know if you encounter any problems or spot any typo's. I read you had some problems with Chinese portscanners, perhaps this technique can help.