After some more exploration, I have found that using the zope ftp server, I can download small files(less than 40KB), but cannot download large files(more than 70KB). Is this a problem of my zope installation or a zope bug? Li Dongfeng wrote:

The problem: Trying to ftp download one GIF image in a zope folder failed, the server give the following error message:

------ 1999-12-24T03:14:10 ERROR(200) ZServer exception in trigger thunk: (exceptions.AttributeError:'None' object has no attribute '_producers' [/home/maldf/Zope-2.1.0b2-src/ZServer/medusa/select_trigger.py|handle_read|82] [/home/maldf/Zope-2.1.0b2-src/ZServer/FTPResponse.py|apply|145] [/home/maldf/Zope-2.1.0b2-src/ZServer/FTPServer.py|retr_completion|360])

But many other GIF images never cause this problem in ftp download. The offending image is at http://www.zope.org/Members/LiDongfeng/test.gif The ftp client used is WS FTP LE version 5.06 on windows. The Zope server is version 2.1.0b2 on solaris 2.6.

Anyone know the cause of this problem?

PS: I have found the offending code in ZServer/FTPServer.py|retr_completion|360, it is:

if not response._wrote: self.client_dc.push(response.body) else: for producer in response.stdout._producers: self.client_dc.push_with_producer(producer)

obviously the response.stdout is None. Why this occured?

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