[Zope] strange image error

[Oliver Petznick]

aloha zopers.

i have a zope2.9 instance installed on a freebsd box - zope is  
installed out of the ports - python2.4 also. if i request a image  
bigger than about 100kb from the server it stops loading after some  
bytes and fires this error (it makes no difference if i use firefox2  
or wget..):

2007-02-13T12:12:28 ERROR ZServer uncaptured python exception,  
closing channel <ZServer.HTTPServer.zhttp_channel connected  
80.190.201.39:63877 at 0xdc96bec channel#: 28 requests:>  
(socket.error:(1, 'Operation not permitted') [/usr/local/lib/ 
python2.4/asynchat.py|initiate_send|219] [/usr/local/www/Zope29/lib/ 
python/ZServer/medusa/http_server.py|send|417] [/usr/local/lib/ 
python2.4/asyncore.py|send|332])

some hints would be cool

thanks in advance, oli