Yes, a working and properly configured firewall is absolutely mandatory.
I recommend you go to shodan.io and enter your public .4 IP there. There are some open ports and services available to the outside and it looks like some software is outdated.
Yes, a working and properly configured firewall is absolutely mandatory.
I recommend you go to shodan.io and enter your public .4 IP there. There are some open ports and services available to the outside and it looks like some software is outdated.