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*** [http://linuxcommand.org/man_pages/ps1.html ps] List the current processes. Input {{kbd | key = <nowiki>ps -aux | grep "PORT_NUMBER"</nowiki>}} e.g. {{kbd | key = <nowiki>ps -aux | grep 443</nowiki>}} | *** [http://linuxcommand.org/man_pages/ps1.html ps] List the current processes. Input {{kbd | key = <nowiki>ps -aux | grep "PORT_NUMBER"</nowiki>}} e.g. {{kbd | key = <nowiki>ps -aux | grep 443</nowiki>}} | ||
** {{Win}} Using the software [http://www.nirsoft.net/utils/cports.html CurrPorts] to check the process and port. e.g. Apache will not running if the 80 port was occupied by skype<ref>[http://stackoverflow.com/questions/4705005/how-to-solve-wamp-and-skype-conflict-on-windows-7 How to solve WAMP and Skype conflict on Windows 7? - Stack Overflow]</ref>. | ** {{Win}} Using the software [http://www.nirsoft.net/utils/cports.html CurrPorts] to check the process and port. e.g. Apache will not running if the 80 port was occupied by skype<ref>[http://stackoverflow.com/questions/4705005/how-to-solve-wamp-and-skype-conflict-on-windows-7 How to solve WAMP and Skype conflict on Windows 7? - Stack Overflow]</ref>. | ||
* Is the port | * Is the port opened for external users? OS firewall or protected by antivirus software. | ||
** {{Linux}} | ** {{Linux}} | ||
*** [http://linux.die.net/man/8/iptables iptables]: (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 smaller line-number will override the rule with larger line-number<ref>[https://fedoraproject.org/wiki/How_to_edit_iptables_rules?rd=User_talk:Rforlot How to edit iptables rules - FedoraProject]</ref> | *** [http://linux.die.net/man/8/iptables iptables]: (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 smaller line-number will override the rule with larger line-number<ref>[https://fedoraproject.org/wiki/How_to_edit_iptables_rules?rd=User_talk:Rforlot How to edit iptables rules - FedoraProject]</ref> | ||