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| == Test connectivity to the web service == | | == Test connectivity for the web service == |
| find the problem occurred: (1) local service at the server (localhost) (2) from LAN to server (3) from WAN to server
| | [[Test connectivity for the web service]] |
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| === Local service ===
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| WAN ○ -------> ○ LAN -------> <span style="color:red">● server</span>
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| Testing on localhost if you have the administrative permission to manage the server.
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| * Check if your computer/server Is being assigned the IP Address.
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| ** {{Linux}}: (1) Check the IP Address. {{kbd | key = ifconfig}}. (2) Re-assign the IP Address and restart the networking service. {{kbd | key = service network restart}} for CentOS<ref>[http://askubuntu.com/questions/230698/how-to-restart-the-networking-service How to restart the networking service? - Ask Ubuntu]</ref>
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| ** {{Win}}: Check the IP Address. {{kbd | key = ifconfig/all}}
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| ** More on [[Network problem]]
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| * Is service alive? Is the port occupied by other process?
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| ** {{Linux}}
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| *** [http://linux.die.net/man/1/nmap nmap] "Network exploration tool and security / port scanner." e.g. {{kbd | key = <nowiki>nmap -p 80,443 ip</nowiki>}}
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| *** [http://linux.die.net/man/8/ss ss] "utility to investigate sockets" e.g. {{kbd | key = <nowiki>ss -tnlp | grep 80</nowiki>}} or using OR operator<ref>[http://www.thegeekstuff.com/2011/10/grep-or-and-not-operators/ 7 Linux Grep OR, Grep AND, Grep NOT Operator Examples]</ref> {{kbd | key = <nowiki>ss -tnlp | grep '80\|443'</nowiki>}}
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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>}}
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| ** {{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>.
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| * Is the port opened for external users? OS firewall or protected by antivirus software.
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| ** {{Linux}}
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| *** [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>
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| *** [https://fedoraproject.org/wiki/FirewallD FirewallD] rules: (1) {{kbd | key = <nowiki>sudo firewall-cmd --get-default-zone</nowiki>}} return 'public' (2) {{kbd | key = <nowiki>sudo firewall-cmd --list-all --zone=public</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> (3) Allow port with FirewallD
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| *** [http://linux.die.net/man/8/semanage SELinux Policy Management]: (1) After installed {{kbd | key =policycoreutils-python}}<ref>[http://sharadchhetri.com/2014/10/07/semanage-command-found-centos-7-rhel-7/ semanage command not found on CentOS 7 and RHEL 7]</ref>, input {{kbd | key = <nowiki>semanage port -l</nowiki>}} to list open ports. (2) Allow port with semanage.
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| ** {{Win}} [https://technet.microsoft.com/en-us/library/cc754274.aspx?f=255&MSPPError=-2147217396 Windows Firewall with Advanced Security] -> configure firewall rules
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| ** protected by antivirus software?
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| * connect to localhost ex: {{kbd | key= telnet 127.0.0.1 23}} where 23 is the port number where the service running
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| ** [https://technet.microsoft.com/en-us/library/cc771275(v=ws.10).aspx Install Telnet Client] on {{Win}}
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| ** if the local service is web server, you can also try {{kbd | key = <nowiki>lynx http://127.0.0.1</nowiki>}} for {{Linux}}
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| * double [[Testing#check_the_server.2Fservice_logs | check the server/service logs]]
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| === (2) from LAN to server ===
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| WAN ○ -------> <span style="color:red">● LAN -------> ● server</span>
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| * testing on LAN (local network, subnet scope): Is service alive? The different servers between LAN or with the same ip class (ex: 1.2.3.*) may not have the firewall limit.
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| ** connect to localhost ex: {{kbd | key= telnet 172.18.0.1 23}} (1) IP start with 172.18... is [http://www.itcom.itd.umich.edu/backbone/umnet/privateIP.html Private IP Network Numbers] (2) where 23 is the port number where the service running
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| *** If the local service is web server, you can also try to connect the internal ip e.g. {{kbd | key = <nowiki>lynx http://172.18.0.1</nowiki>}} for {{Linux}}
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| * double [[Testing#check_the_server.2Fservice_logs | check the server/service logs]]
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| === (3) from WAN to server ===
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| <span style="color:red">WAN ● -------> ● LAN -------> ● server</span>
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| We met the trouble on WAN (wide area network). If we do no have the administrative permission, the tests we can do as follows:
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| * [http://downforeveryoneorjustme.com/ Down for everyone or just me?] more on [[Web_Ping#同時從世界各處測試網站連線 | Web Ping]]
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| * Switch to different ISP? Is hardware firewall enabled?
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| * Is gateway alive?
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| * Is DNS alive?
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| * Is the external IP correct?
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| ** If the firewall rule is IP specified, verify the IP if correct from [http://whatismyipaddress.com/ What Is My IP Address?] or web access log.
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| ** Query the [http://ipinfo.io/ IP Address Details - ipinfo.io]. e.g. Input the command {{kbd | key = <nowiki>curl ipinfo.io/ip</nowiki>}}<ref>[https://askubuntu.com/questions/95910/command-for-determining-my-public-ip#comment1318649_95910 networking - Command for determining my public IP? - Ask Ubuntu]</ref> for {{Mac}} & {{Linux}}
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| * Is the port was opened for external users? [http://www.portchecktool.com/ Open Port Check Tool - Port Forwarding Port Check Tool]
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| * Is institutional/ISP firewall enabled? Contact your MIS. ([https://en.wikipedia.org/wiki/Management_information_system Management information system]) of your company or ISP?
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| other issue:
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| * bandwidth cost too much by certain users
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| * exceed the request limit of (hardware) firewall
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| * the external connection of updated Windows was down until reboot {{Win}}
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| * Amazon EC2 security group
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| * refresh browser cache: [http://refreshyourcache.com/en/cache/ Refresh your cache - When hitting F5 just isn't enough!]
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| == connection test ==
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| === case 1: Access the server from outside network ex: WAN ===
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| Where are you? Access the server from outside network ex: Wide Area Network (WAN) or Local Area Network (LAN)
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| Open the browser from outside network ex: Wide Area Network (WAN) or Local Area Network (LAN)
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| * and type the address: {{kbd | key =<nowiki>http://the.domain</nowiki>}} {{exclaim}} Note: Not [https://en.wikipedia.org/wiki/Private_network Private network] / Private IP address
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| * or use the remote website monitoring services: [[Web Ping]]
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| Using alternative web services if the Python was installed
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| * (for python 2.x) {{kbd | key=<nowiki>python -m SimpleHTTPServer <port></nowiki>}}<ref>[https://docs.python.org/2/library/simplehttpserver.html 20.19. SimpleHTTPServer — Simple HTTP request handler — Python 2.7.17 documentation]</ref>
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| * (for python 3.x) {{kbd | key=<nowiki>python -m http.server <port></nowiki>}}<ref>[https://docs.python.org/3.8/library/http.server.html?highlight=http%20server#module-http.server http.server — HTTP servers — Python 3.8.1 documentation]</ref>
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| Using telnet client
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| * (optional) [https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc771275(v=ws.10) Install Telnet Client | Microsoft Docs] on {{Win}}. [https://medium.com/@blackSource/bring-telnet-back-on-macos-high-sierra-11de98de1544 Bring telnet back on macOS high Sierra – Ayuth Mangmesap (blackSource) – Medium] on {{Mac}}
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| * telnet ''DOMAIN_or_IP'' ''PORT'' ex: {{kbd | key = telnet the.domain 80}}
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| ** If connected. The console windows will show the message "Escape character is '^]'. " for {{Linux}}. Or show a blank window for {{Win}} If you want to end the telnet command. You can (1) press {{Kbd plus | key1 = Ctrl | key2 = ]}} and (2) keyin {{Kbd | key = quit}} to end the telnet.
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| ** If failed. It will show the message: "telnet: Unable to connect to remote host: Connection refused"
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| curl
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| * {{kbd | key = curl -v -o /dev/null http://IP:Port}} If failed. It will show the message: "failed: Connection refused"
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| tools
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| # [http://check-host.net/ Check server: Check host - online website monitoring, Check IP] "checks the possibility of a TCP connection to host's specified port from different locations around the world." quoted from website. {{access | date=2015-08-02}}
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| === case 2: Access the server from inside ex: localhost or Local LAN ===
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| If you has permission to log in the server via SSH or Remote desktop service.
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| * (1)open the browser, (2)type the address: {{kbd | key = <nowiki>http://127.0.0.1</nowiki> }}
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| * [http://www.canyouseeme.org/ Open Port Check Tool]: ''Using browser'' to check the specified port of local machine from canyouseeme.org. {{exclaim}} it may returned wrong result if the server hosted with shared external IP
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| * Linux command:
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| *# (optional if lynx was not installed) {{kbd | key = <nowiki>yum install lynx</nowiki>}} for CentOS / {{kbd | key = <nowiki>sudo apt-get install lynx</nowiki>}} for Ubuntu<ref>[http://www.addictivetips.com/ubuntu-linux-tips/install-and-use-lynx-on-ubuntu/ Install and Use Lynx Browser on Ubuntu]</ref>
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| *# {{kbd | key = <nowiki>lynx http://127.0.0.1</nowiki>}} <ref>[http://lynx.isc.org/lynx2.8.7/lynx2-8-7/lynx_help/Lynx_users_guide.html Lynx Users Guide v2.8.7]</ref> for {{Linux}}
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| telnet
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| # {{kbd | key = telnet 127.0.0.1 80}}
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| # (after telnet-ed the web 80 port, key in) {{kbd_plus | key1 = get | key2 = SPACE}}
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| # more on [http://www.simplescripts.de/http-check-port-80-telnet-command.htm HTTP Check Port 80 with the Telnet Command]
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| netstat ex: find MySQL 3306 port
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| # {{kbd | key = <nowiki>netstat -a | find "3306"</nowiki>}} (note: require the '''double quote''' symbol, not single quote symbol) for {{Win}}<ref>[http://technet.microsoft.com/en-us/library/bb490947.aspx Netstat]</ref> or {{kbd | key = <nowiki>netstat -npl | grep 3306</nowiki>}}<ref>[http://www.cyberciti.biz/faq/find-out-which-service-listening-specific-port/ Linux / UNIX Find Out What Program / Service is Listening on a Specific TCP Port]</ref> for {{Linux}}
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| # more on [http://www.techrepublic.com/blog/security/list-open-ports-and-listening-services/443 List open ports and listening services]
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| tools
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| # {{Gd}} [http://www.nirsoft.net/utils/cports.html CurrPorts: Monitoring TCP/IP network connections on Windows]
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| # [http://portforward.com/help/portcheck.htm PFPortCheck Program]: check TCP/UDP port from localhost(where you installed the program) to portforward.com
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| # [http://technet.microsoft.com/en-us/sysinternals/bb897437 TCPView for Windows]
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| == user client node == | | == user client node == |
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| * Desktop search: [[Desktop search#Search_text_in_files | Search text in files]] | | * Desktop search: [[Desktop search#Search_text_in_files | Search text in files]] |
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| : [[Image:Owl icon.jpg]] If the message text or code snippets was '''not found''' in the ''plain text files'', it may stored in the ''database''.
| | {{Tips}} If the message text or code snippets was '''not found''' in the ''plain text files'', it may stored in the ''database''. |
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| == related topic == | | == related topic == |
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| * [[Bug report template]] | | * [[Bug report template]] |
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| == references == | | == References == |
| <references/> | | <references/> |
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| [[Category:MySQL]] | | [[Category:MySQL]] |
| [[Category:Linux]] | | [[Category:Linux]] |
| | [[Category:Testing]] |
