Please see the below explanation from our ISP .... What I am trying to do is change the default listen port (ftp) of 21 to a four digit port number. When our ISP opens the firewall xxxx I can connect using the new port (via my client) but I cannot get a filelist via the client (outside of the firewall) Does their explanation make sense ? Is there anything I can do since we are using z/vm 3.1 to resolve the filelist problem. Thank you...Neil =========explanation from ISP=============================================
In Standard FTP When a client starts an FTP connection, It opens a standard TCP channel from one of its high order port 21 on the server. This channel is called the command channel. When the client requests data from the server, it tells the server to send the data to a specified higher order port. The server acknowledges the request and initiates a connection from its own port 20 to the high-order port that the client requested. This channel is called the data channel In Passive FTP In this mode the command channel works in the same way as in a standard FTP connection, but the data channel setup works differently. When the client uses a non-standard FTP port and requests data from the server, it asks the server whether it accepts Passive FTP (PFTP) connections. If the server accepts PFTP connections, it sends the client a high-order port number to use for the data channel. The client then initiates the data connection from its own high-order port to the port that the server sent. So basically I was trying to say unlike in Standard ftp mode where the server does the data communication on port 20, in Passive ftp mode the Client comes up with a higher port number to talk to the server ==================================================================================== >>> <[EMAIL PROTECTED]> 3/9/2007 3:54 AM >>> Hi Neil, There is no configuration file setting that I know of. Instead, use the PASSIVE FTP subcommand at the start of your FTP session to set passive mode on. Peter -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Neil Carson Sent: March 8, 2007 15:46 To: IBMVM@LISTSERV.UARK.EDU Subject: z/VM 3.1 FTP Hello, We are running z/VM 3.1. With the TCP/IP that ships with the above is it possible to have the ftpserver operate in passive mode. I am looking in SRVRFTP CONFIG and I do not see anything referring to passive mode. Is there another config file somewhere ? Thank you in advance. Neil The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review retransmission dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient or delegate is strictly prohibited. If you received this in error please contact the sender and delete the material from any computer. The integrity and security of this message cannot by guaranteed on the Internet. The Sender accepts no liability for the content of this e-mail or for the consequences of any actions taken on basis of the information provided. The recipient should check this e-mail and any attachments for the presence of viruses. The sender accepts no liability for any damage caused by any virus transmitted by this e-mail. This disclaimer is the property of the TTC and must not be altered or circumvented in any manner.
