weird connection problem with IIS6

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From: ferrosti (ferrosti.13zfxm_at_mail.webservertalk.com)
Date: 03/31/04 

Date: Wed, 31 Mar 2004 06:24:20 -0600

Hi folks,

I have already taken a look at all those connection threads and googled
around. Somehow I cannot fix this specific problem.

I have a Linux Server which is running some perl programs to send log
files to the IIS6 ftp server. The programs use the libnet net::ftp
module for the ftp transfer. I did not find any issues with that,
either.
We have isolated the specific program parts and made a standalone of
it. All that it does is sending a file and then getting it for checking
md5 sums.

The same program works fine for 70 per cent of the time, but in the
rest we encounter a "connection closed" error. I donßt know where this
comes from. I have set the timeout to 600 secs, but no chance. I should
also mention, that the files are only a few megabytes.
For a stress test I tried the same with a 500 MB file. It is all the
same. The load is handled through a GBit direct link with a private IP
address.

Included is an excerpt of the IIS6 logfile. I have deleted critical
information.

2004-03-31 09:27:52 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]USER +++++++ - 331 0 0 0 0 FTP - - - -
2004-03-31 09:27:52 192.168.50.20 ++++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]PASS - - 230 0 0 0 0 FTP - - - -
2004-03-31 09:27:52 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]CWD /ftp_backup - 250 0 0 0 0 FTP - - - -
2004-03-31 09:27:54 192.168.50.20 +++++++ MSFTPSVC606538788 +++++++
192.168.20.20 21 [74]created
/ftp_backup/documents.backup.20040330_backup_document_queue.tgz - 226 0
0 18308805 844 FTP - - - -
2004-03-31 09:27:54 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]sent
/ftp_backup/documents.backup.20040330_backup_document_queue.tgz - 226 0
0 0 844 FTP - - - -
2004-03-31 09:27:54 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]sent
/ftp_backup/documents.backup.20040330_backup_document_queue.tgz - 550 2
0 0 844 FTP - - - -
2004-03-31 09:27:55 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]created
documents.backup.20040330_backup_document_queue.tgz - 425 10061 0 0 968
FTP - - - -
2004-03-31 09:27:55 192.168.50.20 +++++++ MSFTPSVC606538788 ++++++++++
192.168.20.20 21 [74]QUIT - - 200 0 0 0 0 FTP - - - -

Maybe someone already sees the problem...
Well, I donīt know.

Regards, Chris 

--
ferrosti
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