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→troubleshooting steps for connection test
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** Is service alive? | ** Is service alive? | ||
** OS firewall ex: server with iptable limit for {{Linux}}? Firewall option for {{Win}}? | ** OS firewall ex: server with iptable limit for {{Linux}}? Firewall option for {{Win}}? | ||
*** {{Linux}} (1) {{kbd | key = iptables -L}} to list all rules<ref>[http://wiki.centos.org/HowTos/Network/IPTables HowTos/Network/IPTables - CentOS Wiki]</ref> (2) rule with lower line-number will override the rule with higherer line-number<ref>[https://fedoraproject.org/wiki/How_to_edit_iptables_rules?rd=User_talk:Rforlot How to edit iptables rules - FedoraProject]</ref> | *** {{Linux}} | ||
**** (1) {{kbd | key = iptables -L}} to list all rules<ref>[http://wiki.centos.org/HowTos/Network/IPTables HowTos/Network/IPTables - CentOS Wiki]</ref> (2) rule with lower line-number will override the rule with higherer line-number<ref>[https://fedoraproject.org/wiki/How_to_edit_iptables_rules?rd=User_talk:Rforlot How to edit iptables rules - FedoraProject]</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 | |||
** protected by antivirus? | ** protected by antivirus? | ||
** connect to localhost ex: {{kbd | key= telnet 127.0.0.1 23}} 23 is the port number where the service running | ** connect to localhost ex: {{kbd | key= telnet 127.0.0.1 23}} 23 is the port number where the service running | ||