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FTP closing a connection with 421 121 error

Posted on 2010-09-23
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Last Modified: 2013-12-09
I have been having a problem with automated ftp transfers hanging up in the middle of getting one of a number of files...it is nothing to do with firewalls, or the actual transfer, or the specific file as the exact same file will transfer fine when the process is restarted.

I understand that the 421 error is indicative of a timeout. Unfortunately, while I have control over the client process it needs to have long timeouts on that side as it is used to transfer some very large files. I do not have control over the sending ftp sites in any way. I mentioned the 421 121 error as I was able to get the log from one of the ftp sites and it is shown below (I have obscured IPs etc;200.200.01.01 is my client IP). If you look at the log, you will see that another system (10.10.10.01) did a transfer inbetween mine of ABC.27192  and my failed transfer of
ABC.27193 . Those should occur in a very short time frame on the client;but you can see that they are actually separated by several  minutes. As I said I have complete control over the client side, so does any one think there is something I can do which will halp (for example do a getsystem call). I really don't want to drop the connection on each file.

Thanks in advance for any help which you can provide.

11:50:07 200.200.01.01 [17043]USER user1 331 0
11:50:07 200.200.01.01 [17043]PASS - 230 0
11:50:07 200.200.01.01 [17043]CWD /user1/def 250 0
11:50:07 200.200.01.01 [17044]USER user1 331 0
11:50:07 200.200.01.01 [17044]PASS - 230 0
11:50:07 200.200.01.01 [17044]CWD /user1/def 250 0
11:51:13 200.200.01.01 [17043]sent /user1/def/ABC.27192 226 0
11:51:13 200.200.01.01 [17043]RNFR ABC.27192 350 0
11:51:13 200.200.01.01 [17043]RNTO ABC.27192.done 550 5
11:52:06 10.10.10.01 [17045]USER user2 331 0
11:52:06 10.10.10.01 [17045]PASS - 230 0
11:52:06 10.10.10.01 [17045]created /user2/ABC.27198.tmp 226 0
11:52:06 10.10.10.01 [17045]RNFR /user2/ABC.27198.tmp 350 0
11:52:06 10.10.10.01 [17045]RNTO /user2/ABC.27198 250 0
11:52:06 10.10.10.01 [17045]QUIT - 250 0
11:53:15 200.200.01.01 [17043]sent /user1/def/ABC.27193 426 121
11:53:45 200.200.01.01 [17043]closed - 421 121
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Question by:bertholdra
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Kyle Abrahams earned 500 total points
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