On Friday, 03/27/2009 at 11:28 EDT, Michael Coffin <michaelcof...@mccci.com> wrote: > I've been noticing a lot of errors being reported on my FTP server console > lately. Every 5 minutes, the FTP server wakes up and attempts to do > "something" that fails and generates multiple error messages. It seems to > issue one DTCFTS2512I for each record in FTP BANNER, for example here is the > console log from an unused FTP server that has a 1 record FTP BANNER: > > 10:34:50 DTCFTS0021I Server-FTP: Initialization completed 10:34:50 EDT FRIDAY > 2009-03-27 > DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted the connect > 10:36:00 ion > 10:36:00 DTCFTS2512I Error completion on #0: No such connection > 10:41:00 DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connect > 10:41:00 ion > 10:41:00 DTCFTS2512I Error completion on #1: No such connection > 10:46:00 DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connect > 10:46:00 ion > 10:46:00 DTCFTS2512I Error completion on #2: No such connection > 10:51:00 DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connect > 10:51:00 ion > 10:51:00 DTCFTS2512I Error completion on #0: No such connection > 10:56:00 DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connect > 10:56:00 ion > 10:56:00 DTCFTS2512I Error completion on #1: No such connection > > The "Error completion on #" starts at 0 and increments to 2 and then restarts > at 0 consistently. > > Tracing FTP doesn't provide a heck of a lot of useful information:
I would have to disagree. :-) You actually get very detailed information! > DTCFTS0023I Got note Connection state changed for #1, Open A client has connected to the FTP server. The FTP server is a Pascal application an so uses an API that doesn't resemble C-style sockets. (See the TCP/IP Programmer's Reference.) > DTCFTS2502I Allocating buffer of 32768 bytes > DTCFTS4050I Send reply '220-BANNER LINE 1' > DTCFTS4050I Send reply ' BANNER LINE 2' > DTCFTS4050I Send reply ' BANNER LINE 3' The API has accepted 3 lines for sending. This doesn't mean they have actually been sent. > DTCFTS4050I Send reply ' BANNER LINE 4' > DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connection The client broke the session at some point and TCP has received the closure. TCP knows that it cannot send data and so the TcpFSend function is failing *synchronously*. > DTCFTS4050I Send reply ' BANNER LINE 5' > DTCFTS4030E TryToSend gets error from TcpFSend: Foreign host aborted > the connection : <repeat> I suspect this is a bug. The FTP server should have stopped after the first error was detected. > 10:11:00 DTCFTS4026I ReinitContConn(1) The FTP server is setting defaults for the control connection (better late than never?). > 10:11:00 DTCFTS4020I GetData(1) > 10:11:00 DTCFTS4022I In GetData, TcpFReceive: Where = 1 FTP server now goes to await a command from the client. > 10:11:00 DTCFTS0023I Got note Connection state changed for #1, Nonexistent > 10:11:00 DTCFTS0024I Foreign host aborted the connection > 10:11:00 DTCFTS2511I CloseCompleted on #1: Foreign host aborted the connection The FTP server is now processing the stack's *asynchronous* notification that state has changed on the control connection. Alan Altmark z/VM Development IBM Endicott
