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**** [https://fedoraproject.org/wiki/FirewallD FirewallD] rules ex: {{kbd | key = <nowiki>firewall-cmd --list-all-zones</nowiki>}}<ref>[https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7 How To Set Up a Firewall Using FirewallD on CentOS 7 | DigitalOcean]</ref> | **** [https://fedoraproject.org/wiki/FirewallD FirewallD] rules ex: {{kbd | key = <nowiki>firewall-cmd --list-all-zones</nowiki>}}<ref>[https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7 How To Set Up a Firewall Using FirewallD on CentOS 7 | DigitalOcean]</ref> | ||
**** [http://linux.die.net/man/8/semanage SELinux Policy Management] ex: {{kbd | key = <nowiki>semanage port -l</nowiki>}} to list open ports | **** [http://linux.die.net/man/8/semanage SELinux Policy Management] ex: {{kbd | key = <nowiki>semanage port -l</nowiki>}} to list open ports | ||
*** {{Win}} Firewall | *** {{Win}} [https://technet.microsoft.com/en-us/library/cc754274.aspx?f=255&MSPPError=-2147217396 Windows Firewall with Advanced Security] -> configure firewall rules | ||
** protected by antivirus? | ** protected by antivirus? | ||
** connect to localhost ex: {{kbd | key= telnet 127.0.0.1 23}} where 23 is the port number where the service running | ** connect to localhost ex: {{kbd | key= telnet 127.0.0.1 23}} where 23 is the port number where the service running |