Thanks, Alan. Confirmation with explanation, as usual. It helps to keep me from asking the same question the next time (if I can remember that I had the problem before, that is).
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Alan Altmark > Sent: Wednesday, July 02, 2008 3:58 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: FTP Problem > > On Wednesday, 07/02/2008 at 03:57 EDT, "Schuh, Richard" > <[EMAIL PROTECTED]> > wrote: > > Near the end of a 605MB (the size of the VMARC file; unpacked, it is > over > > 2.7GB) FTP, I got the message "421 Service not available, closing > control > > connection." Dumb me, I looked in the numbered client and server > messages and > > could not find a 421. Then I looked in the section called > "Reply Code > Messages" > > and found a 421 with different text. > > The text comes from the server. The architected part of the > response is the "421", telling the client what to do. > > > It says to issue an Open command to > > reestablish connection with the server. This brings to mind > a couple > > of questions with my guesses in parentheses: > > > > Is there any point in resuming the connection if all I was doing was > sending > > one file? (probably not) > > If I do reestablish the connection, will the FTP be > resumed, picking > > up > where > > it was when the connection was lost ? (no) > > No, there's no point since both ends would have to support > the FTP "restart" function. z/VM doesn't. > > > What is needed in the way of an Open command? (irrelevant > if my first > > 2 > guesses > > are correct) I entered no such command initially, I entered an FTP > command, > > answered the userid and password prompts, then entered the commands > > BIN > and PUT. > > I the loss of service appears to have been outside of VM. > Is there any > way to > > determine if the loss was at the vendor's server or > somewhere between > the two > > endpoints? > > Only by gathering packet traces on both sides of your proxy > firewall. If RESET or CLOSE packets are sent in two > directions, it indicates that the firewall terminated your session. > > The OPEN subcommand is used to establish a session when > you're already in the FTP client. > > Alan Altmark > z/VM Development > IBM Endicott >
