Date: Thu, 27 Jan 2000 22:11:32 -0600 (CST) From: Ryan Thompson <freebsd@sasknow.com> To: Colin Campbell <sgcccdc@citec.qld.gov.au> Cc: freebsd-questions@freebsd.org Subject: Re: FTP: 425 Can't build data connection: operation timed out Message-ID: <Pine.BSF.4.10.10001272143050.55916-200000@sasknow.com> In-Reply-To: <Pine.LNX.4.10.10001281342090.10829-100000@guru.citec.qld.gov.au>
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[-- Attachment #1 --] On Fri, 28 Jan 2000, Colin Campbell wrote: > Hi, > > The data connection timing out means the remote ftp server cannot connect > to your box. It will be coming from port 20 back to your box on a port > nominated by your ftp client. Something is blocking the connection from > the remote server. Do you have packet filters or similar on your box? Indeed, I am running ipfw... However, the setup is, and has always been open. FTP worked like a charm as of the 25th (every 2 hours, even :-). Connections TO the ftp server on the router from localhost, local LAN and remote hosts work correctly. Tried turning passive mode on on one of these buggy connections (example with ftp.cdrom.com: ftp> passive Passive mode on. ftp> ls 500 'ORT 139,142,245,96,168,88': command not understood Passive mode refused. ftp> ls 500 '': command not understood Passive mode refused. ftp> ls 227 Entering passive mode (209,155,82,18,96,167) ftp: connect: Connection refused ftp> passive Passive mode off. Funny...? I never knew there was an 'ORT' command... I don't think that's in the RFC :-) I tried going in via telnet wcarchive.cdrom.com 21, then logging in and supplying my own port command to send/receive on port 21. Still, no luck. Received the 425 Can't build data connection ... error after a few minutes. Attached is tcpdump output (fed through "grep wcarchive") for a session like the one above. I'm not the best at deciphering tcpdump output... But maybe somebody can clue me in. For kicks, I even tried a tcpdump on the internal network's NIC on the router while I was trying this, but didn't see anything out of the ordinary. -- Ryan Thompson <ryan@sasknow.com> 50% Owner, Sysadmin SaskNow Technologies http://www.sasknow.com #106-380 3120 8th St E Saskatoon, SK S7H 0W2 [-- Attachment #2 --] 21:58:15.220022 www.4907 > wcarchive.cdrom.com.ftp: P 2650612463:2650612529(66) ack 2058698042 win 17520 (DF) [tos 0x10] 21:58:15.256134 www.4910 > wcarchive.cdrom.com.ftp: P 2742694133:2742694143(10) ack 3148606659 win 17520 (DF) [tos 0x10] 21:58:15.628825 wcarchive.cdrom.com.ftp > www.4907: P 1:31(30) ack 66 win 17520 [tos 0x10] 21:58:15.635494 wcarchive.cdrom.com.ftp-data > www.49404: S 3190143704:3190143704(0) win 16384 <mss 1460> [tos 0x8] 21:58:15.635826 www.49404 > wcarchive.cdrom.com.ftp-data: R 0:0(0) ack 3190143705 win 0 21:58:15.659964 www.4907 > wcarchive.cdrom.com.ftp: P 66:72(6) ack 31 win 17520 (DF) [tos 0x10] 21:58:15.994044 wcarchive.cdrom.com.ftp > www.4907: P 31:85(54) ack 66 win 17520 [tos 0x10] 21:58:15.994903 wcarchive.cdrom.com.ftp > www.4907: P 85:115(30) ack 66 win 17520 [tos 0x10] 21:58:16.009706 wcarchive.cdrom.com.ftp > www.4907: . ack 72 win 17514 [tos 0x10] 21:58:16.010273 wcarchive.cdrom.com.ftp-data > www.49405: S 3190748565:3190748565(0) win 16384 <mss 1460> [tos 0x8] 21:58:16.010666 www.49405 > wcarchive.cdrom.com.ftp-data: S 2746235331:2746235331(0) ack 3190748566 win 17520 <mss 1460> (DF) 21:58:16.059915 www.4907 > wcarchive.cdrom.com.ftp: . ack 115 win 17490 (DF) [tos 0x10] 21:58:16.382051 wcarchive.cdrom.com.ftp-data > www.49405: . ack 1 win 17520 [tos 0x8] 21:58:16.382230 wcarchive.cdrom.com.ftp > www.4907: P 115:172(57) ack 72 win 17520 [tos 0x10] 21:58:16.386484 wcarchive.cdrom.com.ftp > www.4907: P 172:196(24) ack 72 win 17520 [tos 0x10] 21:58:16.387619 wcarchive.cdrom.com.ftp-data > www.49405: FP 1:607(606) ack 1 win 17520 [tos 0x8] 21:58:16.387919 www.49405 > wcarchive.cdrom.com.ftp-data: . ack 608 win 16914 (DF) 21:58:16.459922 www.4907 > wcarchive.cdrom.com.ftp: . ack 196 win 17409 (DF) [tos 0x10] 21:58:18.220019 www.4910 > wcarchive.cdrom.com.ftp: P 0:10(10) ack 1 win 17520 (DF) [tos 0x10] 21:58:18.220125 www.4907 > wcarchive.cdrom.com.ftp: P 70:72(2) ack 196 win 17409 (DF) [tos 0x10] 21:58:18.251343 wcarchive.cdrom.com.ftp > www.4910: P 1:59(58) ack 10 win 17520 [tos 0x10] 21:58:18.259977 www.4910 > wcarchive.cdrom.com.ftp: . ack 59 win 17520 (DF) [tos 0x10] 21:58:18.602126 wcarchive.cdrom.com.ftp > www.4907: . ack 72 win 17520 [tos 0x10] 21:58:18.602182 wcarchive.cdrom.com.ftp > www.4910: . ack 10 win 17520 [tos 0x10] 21:58:19.248288 www.4910 > wcarchive.cdrom.com.ftp: P 10:20(10) ack 59 win 17520 (DF) [tos 0x10] 21:58:19.668862 wcarchive.cdrom.com.ftp > www.4910: P 59:1083(1024) ack 20 win 17520 [tos 0x10] 21:58:19.669416 wcarchive.cdrom.com.ftp > www.4910: P 1083:1591(508) ack 20 win 17520 [tos 0x10] 21:58:19.676018 www.4910 > wcarchive.cdrom.com.ftp: P 20:26(6) ack 1591 win 17520 (DF) [tos 0x10] 21:58:20.081965 wcarchive.cdrom.com.ftp > www.4910: P 1591:1630(39) ack 26 win 17520 [tos 0x10] 21:58:20.082022 wcarchive.cdrom.com.ftp > www.4910: . ack 26 win 17514 [tos 0x10] 21:58:20.082720 www.4910 > wcarchive.cdrom.com.ftp: . ack 1630 win 17520 (DF) [tos 0x10] 21:58:21.391847 www.4910 > wcarchive.cdrom.com.ftp: P 26:55(29) ack 1630 win 17520 (DF) [tos 0x10] 21:58:21.718747 wcarchive.cdrom.com.ftp > www.4910: . ack 55 win 17491 [tos 0x10] 21:58:21.718868 wcarchive.cdrom.com.ftp > www.4910: P 1630:1660(30) ack 55 win 17520 [tos 0x10] 21:58:21.719600 www.4910 > wcarchive.cdrom.com.ftp: P 55:61(6) ack 1660 win 17520 (DF) [tos 0x10] 21:58:22.036744 wcarchive.cdrom.com.ftp > www.4910: . ack 61 win 17514 [tos 0x10] 21:58:22.036803 wcarchive.cdrom.com.ftp-data > www.56041: S 3206128389:3206128389(0) win 16384 <mss 1460> [tos 0x8] 21:58:23.220075 www.4907 > wcarchive.cdrom.com.ftp: P 70:72(2) ack 196 win 17409 (DF) [tos 0x10] 21:58:23.564929 wcarchive.cdrom.com.ftp > www.4907: . ack 72 win 17520 [tos 0x10] 21:58:25.156029 wcarchive.cdrom.com.ftp-data > www.56041: S 3206128389:3206128389(0) win 16384 <mss 1460> [tos 0x8] 21:58:31.551992 wcarchive.cdrom.com.ftp-data > www.56041: S 3206128389:3206128389(0) win 16384 <mss 1460> [tos 0x8] 21:58:33.220232 www.4907 > wcarchive.cdrom.com.ftp: P 70:72(2) ack 196 win 17409 (DF) [tos 0x10] 21:58:33.596119 wcarchive.cdrom.com.ftp > www.4907: . ack 72 win 17520 [tos 0x10] 21:58:39.757813 www.4907 > wcarchive.cdrom.com.ftp: FP 72:78(6) ack 196 win 17520 (DF) [tos 0x10] 21:58:39.759171 www.49405 > wcarchive.cdrom.com.ftp-data: R 1:1(0) ack 608 win 16914 (DF) 21:58:44.385844 wcarchive.cdrom.com.ftp-data > www.56041: S 3206128389:3206128389(0) win 16384 <mss 1460> [tos 0x8] 21:58:53.220517 www.4907 > wcarchive.cdrom.com.ftp: FP 70:78(8) ack 196 win 17520 (DF) [tos 0x10] 21:58:53.605805 wcarchive.cdrom.com.ftp > www.4907: . ack 79 win 17514 [tos 0x10] 21:58:53.606928 wcarchive.cdrom.com.ftp > www.4907: P 196:210(14) ack 79 win 17520 [tos 0x10] 21:58:53.607022 wcarchive.cdrom.com.ftp > www.4907: F 210:210(0) ack 79 win 17520 [tos 0x10] 21:58:53.607362 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:58:53.607465 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:58:55.530000 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 21:58:55.530308 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:58:58.734179 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 21:58:58.734461 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:59:05.122030 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 21:59:05.122345 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:59:09.916944 wcarchive.cdrom.com.ftp-data > www.56041: S 3206128389:3206128389(0) win 16384 <mss 1460> [tos 0x8] 21:59:17.862651 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 21:59:17.862933 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 21:59:41.950921 wcarchive.cdrom.com.ftp > www.4910: P 1660:1715(55) ack 61 win 17520 [tos 0x10] 21:59:42.061282 www.4910 > wcarchive.cdrom.com.ftp: . ack 1715 win 17520 (DF) [tos 0x10] 21:59:43.456370 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 21:59:43.456637 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 22:00:34.617776 wcarchive.cdrom.com.ftp > www.4907: FP 196:210(14) ack 79 win 17520 [tos 0x10] 22:00:34.618280 www.4907 > wcarchive.cdrom.com.ftp: R 2650612540:2650612540(0) win 0 22:00:42.867645 www.4910 > wcarchive.cdrom.com.ftp: P 61:67(6) ack 1715 win 17520 (DF) [tos 0x10] 22:00:43.363482 wcarchive.cdrom.com.ftp > www.4910: . ack 67 win 17514 [tos 0x10] 22:00:43.363925 wcarchive.cdrom.com.ftp > www.4910: P 1715:1729(14) ack 67 win 17520 [tos 0x10] 22:00:43.364027 wcarchive.cdrom.com.ftp > www.4910: F 1729:1729(0) ack 67 win 17520 [tos 0x10] 22:00:43.364592 www.4910 > wcarchive.cdrom.com.ftp: . ack 1730 win 17520 (DF) [tos 0x10] 22:00:43.364870 www.4910 > wcarchive.cdrom.com.ftp: F 67:67(0) ack 1730 win 17520 (DF) [tos 0x10] 22:00:44.050686 wcarchive.cdrom.com.ftp > www.4910: . ack 68 win 17520 [tos 0x10]help
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