Hi Ewald, Are you getting and actual socket connection to the AIX box that is getting reset? In a packet trace you would see the SYN SYNACK ACK handshake to complete the socket connection. If not, it sounds like a firewall issue. Have there been any firewall changes that could block port 21 outbound from your side or inbound to the AIX box? Inbound to the AIX box is unlikely since ping worked.
Port 21 is typically blocked by default and is a favorite of security people to disable. Steve Bireley Vice-President Product Development BlueZone Software 1-404-364-1731 www.bluezonesoftware.com BlueZone Secure FTP is Free -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Ewald Roller Sent: Friday, October 19, 2007 9:22 AM To: [email protected] Subject: FTP timeout on open request Hello all... for about four weeks we have a strange FTP problem. A Servicemachine working for months and gathering data from a remote system suddenly makes problems. The FTP open to the remote system always gets a timout: ftp 128.1.2.120 ( timeout 450 trace VM TCP/IP FTP Level 440 Translate Table: STANDARD about to call BeginTcpIp Connecting to 128.1.2.120, port 21 SysAct 0 21 -2147417480 CC -1 ==> Active open to host 128.1.2.120 port 21 from host 0 port 65535 Foreign host did not respond within OPEN timeout Unable to connect to 128.1.2.120 Foreign host did not respond within OPEN timeout Command: quit SysHalt has been Called Ready; T=0.01/0.02 14:08:40 Ping and traceroute are working well. This is z/VM 4.4, the remote system is an AIX system. A tcpdump analysis by a network guru shows that the z/VM FTP is resetting the packets receiving from the open request to AIX system. But in the tcpdump-file we find no reason for this behavior. Any ideas ? Thanks Ewald Roller Rolf Benz AG & Co. KG
