![]() Right click on Black 135i file and save as.jpgĪs you will see each browser handled the interaction VERY differently Open the browser in privacy mode (to make sure information was not cached) In this example I opened a internet browser and follows the exact same steps each time There is nothing Serv-U can do to force the clients to behave the same or connect when something outside of its control is stopping that connection such as firewall, configuration, antivirus, ISP, or many other factors. Serv-U is only listening for commands and replying to hose commands it does not dictate how or in what order a FTP client send the commands or when it logs off and on.Īs you will see in the following test EVERY FTP client interacts very differently with Serv-U. ![]() Once Serv-U receives that LIST command it will send a the directory listing for that user. 230 - The server sends a 230 reply code in response to a command that has provided sufficient credentials to the server to grant the user access to the FTP server.Īfter this comes a combination of varying commands to retrieve information, apply configuration, and direct the user to correct directory.Īfter the FTP client sends the list of commands it will send a LIST command to the Serv-U server PASS ************ (User password information) 331 User name okay, please send complete E-mail address as password. 220 - The 220 reply code is sent in response to a new user connecting to the FTP server to indicate that the server is ready for the new client ![]() When you go to a browser and type " " and hit enter you will be starting the two way communication with the FTP server and the built in FTP client of the whatever browser you choose.Ī typical Serv-U FTP communication will look something like this in the Serv-U / FTP client log (if the FTP client has a log) ![]() In that list you will find your internet browsers (IE, Chrome, Mozilla) each browser has its own behavior and interaction with Serv-U. When you open up your Serv-U server to port 21 you give your users the option of coming to login from the many FTP client options. I wanted to take some time to review FTP interaction specifically the way Serv-U communicates with web browsers.
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