Port 80 is the default port for http traffic. With blocked port 80 you will need to run your web server on a non-standard port. Port 25 is the default port for sending and receiving mail. ISPs block this port to reduce the amount of spam generated by worms on infected machines within their network.
An established TCP connection toward port 22, the SSH default port, is needed to perform the attack. The attacker must have valid credentials to login to the system via SSH or SFTP. The following products have been confirmed to be vulnerable: Cisco ASR 5000/5500/5700 Series devices running StarOS after 17.7.0 and prior to 18.7.4, 19.5, and 20.2 GRC | Port Authority, for Internet Port 21 Unless another port is specified, FTP servers listen for clients to connect on their port 21. The use of non-default FTP server ports is more common than for other protocols due to the historic trouble with malicious hackers searching for FTP servers on port 21. Use Telnet to Test Open Ports Use Telnet to Test Open Ports Posted by Josh Varghese When troubleshooting connectivity issues, one item a user should check is whether the necessary application port is open on the server. An easy way to do this without having to install any additional software is using the familiar Telnet command. How to open a port in the firewall on Windows 10
Use Telnet to Test Open Ports Posted by Josh Varghese When troubleshooting connectivity issues, one item a user should check is whether the necessary application port is open on the server. An easy way to do this without having to install any additional software is using the familiar Telnet command.
it gives me the same think because in the config of firwal of my win server 2012, the local port of server FTP is 21 but remote port is all. as i said i try telnet 192.168.0.2 22 but it gives the same think NB => on windows server where the ftp server is installed , when i test telnet 192.168.0.2 21 it gives me => 220 Microsoft FTP Service
Using telnet to Test Open Ports | The Complete How-To
There you go - no port 21 open. This shows that there is no ftp listening server service running/started. The first line starts with TCP ServerA:http ServerA.mydomain.com:0 LISTENING This shows port 80 (http) is open as the first entry (port 21 would have been above this if it was open) FTP Penetration Testing on Ubuntu (Port 21) Sep 14, 2017 Powershell - Testing a Port with Test-NetConnection May 25, 2016