[SR-Users] How can I block friendly-scanner?

[Visetel LLC]

I added the following rules on iptables, but it does not work.

iptables -A INPUT -j BLACKLIST
iptables -A BLACKLIST -p udp -m udp --dport 5060 -m string --string
'friendly-scanner' --algo bm -m comment --comment 'friendly-scanner' -j DROP

Any suggestions will be appreciated.
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