Test connectivity for the web service: Difference between revisions

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=== Is the service alive or the port was occupied by other process? ===
=== Is the service alive or the port was occupied by other process? ===
** {{Linux}}  
* {{Linux}}  
*** [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>}}
** [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>}}
*** [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>}}
** [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>}}
*** [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>}}
*** [https://docs.oracle.com/cd/E19504-01/802-5753/6i9g71m3i/index.html netstat Command] {{kbd | key=<nowiki>netstat -tulpn | grep LISTEN</nowiki>}} e.g.  
** [https://docs.oracle.com/cd/E19504-01/802-5753/6i9g71m3i/index.html netstat Command] {{kbd | key=<nowiki>netstat -tulpn | grep LISTEN</nowiki>}} e.g.  
** {{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>.


<pre>
<pre>
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// means the 80 port service is running
// means the 80 port service is running
</pre>
</pre>
* more on [[Find process running on port]]
 
* More on [[Find process running on port]]


=== Is the port opened for external users? ===
=== Is the port opened for external users? ===

Revision as of 15:43, 23 March 2022

find the problem occurred: (1) local service at the server (localhost) (2) from LAN to server (3) from WAN to server


Connecting from the local machine to web service at the same server

WAN ○ -------> ○ LAN -------> ● server

Testing on localhost if you have the administrative permission to manage the server.


Check if your computer/server Is being assigned the IP Address

  • Linux Os linux.png : (1) Check the IP Address. ifconfig. (2) Re-assign the IP Address and restart the networking service. service network restart for CentOS[1]
  • Win Os windows.png : Check the IP Address. ifconfig/all
  • More on Network problem

Is the service alive or the port was occupied by other process?

  • Linux Os linux.png
    • nmap "Network exploration tool and security / port scanner." e.g. nmap -p 80,443 ip
    • ss "utility to investigate sockets" e.g. ss -tnlp | grep 80 or using OR operator[2] ss -tnlp | grep '80\|443'
    • ps List the current processes. Input ps -aux | grep "PORT_NUMBER" e.g. ps -aux | grep 443
    • netstat Command netstat -tulpn | grep LISTEN e.g.
  • Win Os windows.png Using the software CurrPorts to check the process and port. e.g. Apache will not running if the 80 port was occupied by skype[3].
$ netstat -tulpn | grep LISTEN

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      - 

// means the 80 port service is running

Is the port opened for external users?

Check the OS firewall or protected by antivirus software

    • Linux Os linux.png
      • iptables: (1) iptables -L to list all rules[4] (2) rule with smaller line-number will override the rule with larger line-number[5]
      • FirewallD rules: (1) sudo firewall-cmd --get-default-zone return 'public' (2) sudo firewall-cmd --list-all --zone=public[6] (3) Allow port with FirewallD
      • SELinux Policy Management: (1) After installed policycoreutils-python[7], input semanage port -l to list open ports. (2) Allow port with semanage.
    • Win Os windows.png Windows Firewall with Advanced Security -> configure firewall rules
    • protected by antivirus software?
  • connect to localhost ex: telnet 127.0.0.1 23 where 23 is the port number where the service running
    • Install Telnet Client on Win Os windows.png
    • if the local service is web server, you can also try lynx http://127.0.0.1 for Linux Os linux.png
  • double check the server/service logs

Connecting from LAN to the server

WAN ○ -------> ● LAN -------> ● server

Testing on LAN (local network, subnet scope): The different servers between LAN or with the same ip class (ex: 1.2.3.*) may not have the firewall limit.

  • Is the service alive?
  • Connect to the internal IP eg: telnet 172.18.0.1 23 (1) IP start with 172.18... is Private IP Network Numbers (2) where 23 is the port number where the service running
  • If the local service is web server, you can also try to connect the internal IP e.g. lynx http://172.18.0.1 for Linux Os linux.png
  • Double check the server/service logs
  • Is the internal IP correct?

Connecting from WAN to the server

WAN ● -------> ● LAN -------> ● server

We met the trouble on WAN (wide area network). If we do no have the administrative permission, the tests we can do as follows:

other issue:

  1. ↑ How to restart the networking service? - Ask Ubuntu
  2. ↑ 7 Linux Grep OR, Grep AND, Grep NOT Operator Examples
  3. ↑ How to solve WAMP and Skype conflict on Windows 7? - Stack Overflow
  4. ↑ HowTos/Network/IPTables - CentOS Wiki
  5. ↑ How to edit iptables rules - FedoraProject
  6. ↑ How To Set Up a Firewall Using FirewallD on CentOS 7 | DigitalOcean
  7. ↑ semanage command not found on CentOS 7 and RHEL 7
  8. ↑ networking - Command for determining my public IP? - Ask Ubuntu
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