[Zope] URLSessionAdapter and SiteRoot

[Michael Fischer v. Mollard]

Hi!
I've a weird problem with the combination of an URLSessionAdapter and 
SiteRoot: In a folder with an URLSessionAdapter I can't use the 
management Interface, since there seems to be a 'rewriting loop' with 
news sessions, ending in an 'URL to long error' To illustrate the 
problem a snippet from the URL from apaches logfile:

/NLAAdmin/NLAOverview/48655453A0WSQ3E4dzs/pt_editForm/NLAOverview/09137742A0WSQ3HmyLM/NLAAdmin/NLAOverview/pt_editForm/ 
......

What's going wrong here and how can I fix this?