Ip address 126.96.36.199 attempted to access to your firewall using SSH
Its nothing serious and quite often.. Intruders are using automated scripts to try find open ssh, telnet ports on public IPs if ports are open they can use dictionary/brute-force attack to gain unauthorized access
Its reason why is highly recommend limit access for administration services (telnet, ssh , rdp .....) and use strong passwords
it is really not hacked.. there can be lots of messages like this on the firewalls, because the outside interface is on the public segment, which is exposed to the internet !!!! people can do a lot of port scan/ IP scan etc. The firewall will anyway block this and will not let you inside your network.. that is why a firewall is in existance !!!!
if you still want to prevent important protocols like ssh, telnet, snmp etc not hitting ur firewall, you can block them on the outside router's WAN or LAn interface.. you can also ask the ISP to apply security access-lists at their end.. you can ask them to block all unnecessary ports like SSH, telnet, SNMP, NTP etc, which are vulnerable. You can just open ports which are needed, like 80, 443, 21 etc !!!!
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...