In our testing work, we often encounter problems with a product’s website or service not being able to connect. With the help of the previous understanding of network related knowledge, we can conduct preliminary problem screening from the following perspectives.

  • Ping the domain name of the website to confirm if there is a DNS resolution problem;
  • When accessing Intranet services through domain names, verify that the hosts file is configured with domain name mapping;
  • Ping the website IP address to check network connectivity to the target server;
  • Telnet IP+ port to confirm whether the remote service is reachable;
  • Conditional to the server to perform Telnet, to determine whether the service did not start, or was blocked by strong fire;
  • Ping 114.114.114.114 detects whether the public Internet can be accessed;
  • Ifconfig check whether the computer IP, default gateway, DHCP, DNS is correct;
  • Ping default gateway, internal network access point connectivity detected
  • Tracert looks at the routing. When multiple networks are connected or VPNs are used, it is possible to determine whether the request has gone through the correct gateway/route.

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