[Zope] base url is missing port number

[Juergen R. Plasser / Hexagon]

I am using the tool WebStress (http://www.paessler.com/) to test our Zope 
server performance, but I have a problem with the base url:

WebStress gets as base url:

<base href="http://195.xxx.yyy.zzz/" />

But IE gets (the correct url):

<base href="http://195.xxx.yyy.zzz:8181/" />

The WebStress url is missing the port 8181. Why is this so?


Juergen