[Zope] bci.NotAvailable

[Arenz, Ralph]

hello,

i'am using ZPublisher.Client within a Product to call
zope-methods(DTML-methods). For a long time that works well, but for 
a couple of days it doesn't. It seems that the target-url ist called
correctly but sometimes i get an error in the log-file:

  error-type:bci.NotAvailable 
  error-value:Recv timed out(File:[called url] Line:[]) 

How can i fetch more information about the error which cause Client.py
to throw bci.NotAvailable? 
(calling the target-url directly from a browser works well)

any hints?