Hey there fellow Linux friends. I was a Ubuntu user but I now am running Linux Mint 18 Mate 64 on my dell laptop. Anyways I went on the shields up website and I did their firewall test with scanning the first main 1000 ports. It
says on the site that port 22 and port 23 are opened, everytime I scanned it says open. I tried netstat and nothing seems fishy with that. Here is my netstat results as I am posting this,
netstat -lntup
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN 1623/dnsmasq
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 3280/cupsd
tcp6 0 0 ::1:631 :::* LISTEN 3280/cupsd
udp 0 0 0.0.0.0:5353 0.0.0.0:* 973/avahi-daemon: r
udp 0 0 0.0.0.0:40037 0.0.0.0:* 1623/dnsmasq
udp 0 0 127.0.1.1:53 0.0.0.0:* 1623/dnsmasq
udp 0 0 0.0.0.0:68 0.0.0.0:* 4852/dhclient
udp 0 0 192.168.0.12:123 0.0.0.0:* 1229/ntpd
udp 0 0 127.0.0.1:123 0.0.0.0:* 1229/ntpd
udp 0 0 0.0.0.0:123 0.0.0.0:* 1229/ntpd
udp 0 0 0.0.0.0:57897 0.0.0.0:* 973/avahi-daemon: r
udp 0 0 0.0.0.0:631 0.0.0.0:* 3281/cups-browsed
udp6 0 0 :::5353 :::* 973/avahi-daemon: r
udp6 0 0 :::54884 :::* 973/avahi-daemon: r
udp6 0 0 fe80::c15b:4da3:ff3:123 :::* 1229/ntpd
udp6 0 0 ::1:123 :::* 1229/ntpd
udp6 0 0 :::123 :::* 1229/ntpd
So I am not a expert with all of this, but I don't see port 22 and port 23 opened, but maybe I'm not using netstat right or this is a false positive. Is there other ways to check and make sure my computer is OK ? Also doesn't Linux have a built in firewall to prevent this result from Shields up ? Thanks.
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