<div dir="ltr">Hi,<div>Bad boys trying to guess a valid username.</div><div>in sip.conf uncomment alwaysauthreject=yes and Asterisk always reject 1st invite.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Tue, Oct 1, 2013 at 5:26 PM, Gareth Blades <span dir="ltr"><<a href="mailto:mailinglist+asterisk@dns99.co.uk" target="_blank">mailinglist+asterisk@dns99.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
On 01/10/13 15:44, gincantalupo wrote:
<blockquote type="cite">On
Tue, Oct 1, 2013 at 5:07 AM, gincantalupo <span dir="ltr"><<a href="mailto:gincantalupo@fgasoftware.com" target="_blank">gincantalupo@fgasoftware.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hi,<br>
<br>
I get a lot of these messages on my Asterisk CLI:<br>
<br>
"Failed to authenticate user
1000<a><sip:1000@MY_OWN_IP_ADDRESS></a>;tag=03f82bb9"<br>
<br>
as if my PBX machine is trying to authenticate to itself. It
seems someone is attacking my asterisk PBX.<br>
<br>
Is there a way to fix this problem?</blockquote>
</blockquote>
<br>
in sip.conf I have guest connections permitted and have them going
to the default context which contains :-<br>
<br>
[default]<br>
; all unauthenticated connection attempts from the internet come in
here.<br>
exten => _[+*#0-9].,1,NoOp(Unauthenticated call attempt -
${SIP_HEADER(Contact)})<br>
exten => _[+*#0-9].,n,Congestion<br>
<br>
Then in fail2ban I have it match the following :-<br>
<br>
failregex = Registration from .* failed for \'<HOST>\' - Wrong
password <br>
Unauthenticated call attempt .*\@<HOST>\:<br>
<br>
</div>
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