![]() In order for the connection to be established to the network service, it keeps the port open: In the case of the web server, it constantly listens for ports 80 and 443 to accept connections. Certain port numbers are intended for certain services: As an example, port 80 is usually used for unencrypted access to a website, port 443 for encrypted access to a website. Different network ports allow multiple simultaneous connections to one IP address. The port number is used for IP network communication via User Diagram Protocol (UDP) or Transmission Control Protocol (TCP). If "UDP port ?:FILTERED" is output, the port cannot be reached.Ī network port is a number between 5. If the connection is successful, portqry should output the following as a response: "UDP port ? is LISTENING". UDP ports can be tested most easily with the tool "portqry": portqry -n 192.168.1.2 -p udp -o 161 The bandwidth can be measured with the following command psping -b -l 8k -n 10000 Download The psping command can also be used to measure the response time of individual services or ports, as well as the bandwidth: Ping on a portĮxample: psping psping is included in the pstools from Sysinternals (Microsoft), measure bandwidth If the port is open, usually only a "_" flashes in the output: The call is then made in the command prompt: telnet IP/DNS Port telnet 192.168.1.5 443 ![]() ![]() Telnet was a fixed part of the operating system in earlier Windows versions, but in Windows 10 / 11 the telnet command is no longer activated by default, so the command must be added beforehand via Programs and Features: Originally, the telnet command was very often misused in the command prompt to test a specific port. ![]() The command returns for TcpTestSucceeded: True if the port is reachable. Type in the following command: Test-NetConnection -computername -port 443 Windows PowerShell is a fixed component of Windows, therefore a port check can be done via PowerShell without additional software or features. ![]()
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