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thanks liddler, traced the problem down to a cisco router which is configures to use a small packet size when routing out over ISDN cards! Switched the ftp client to a Solaris box and the problem vanished. Looks like W2K could not negotiate the packet size correctly!
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thanks liddler, traced the problem down to a cisco router which is configures to use a small packet size when routing out over ISDN cards! Switched the ftp client to a Solaris box and the problem vanished. Looks like W2K could not negotiate the packet size correctly!

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An ftp transfer of a large file (circa 800k) from the WSFTP client on W2K to a standard Solaris 8 ftp server fails while a small file (circa 5k) is successfull.<br />
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The FTP connection is established on port 21 and a small file tarnsfered OK (port 20 - active). When a large file is transfered the file is created on the Solaris system as 0 blocks and never increases. After a couple of minutes the WSFTP client times out and the transfer fails leaving the target file at 0 blocks.<br />
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'netstat -an' shows connections are left in the 'LISTEN' state on ports 20 &amp;&nbsp;21 on the Solaris server.<br />
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The Twist: if a standard 'ping' is run in paralell from the W2K system the large file transfers OK!!!
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An ftp transfer of a large file (circa 800k) from the WSFTP client on W2K to a standard Solaris 8 ftp server fails while a small file (circa 5k) is successfull.

The FTP connection is established on port 21 and a small file tarnsfered OK (port 20 - active). When a large file is transfered the file is created on the Solaris system as 0 blocks and never increases. After a couple of minutes the WSFTP client times out and the transfer fails leaving the target file at 0 blocks.

'netstat -an' shows connections are left in the 'LISTEN' state on ports 20 & 21 on the Solaris server.

The Twist: if a standard 'ping' is run in paralell from the W2K system the large file transfers OK!!!

WSFTP on W2K to Solaris 8 FTP server timeout on large files

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.