Well I've tested your script with an old backup of Zope 2.3.2 on an Win NT SP 5 machiene. There are no problems. The script runs in one window and in the other I can surf the management screen. My Solaris can't do that. On Solaris and on NT I could see your second problem. When I press cancel on the Browser the process/thread doesn't stop. Thats really a problem. I started your script twice and the machiene (NT) is nearly not usable anymore. But thats better than Solaris - there I can't start the process twice! For me I've prooven that there is something VERY WEIRD with the Solaris Zope. OK it might not be Zope but Python. As for me I need an answer / solution desperately! Any ideas anybody? My primary guess is, that Solaris doesn't relese the threads after using them. I've tried a threaded Python script on my Solaris machiene and that had no problems. But I must confess I have no clue on how Zope Threading works. Therefore my test doesn't proove anything really. By the way...it also shows how fast Zope really is because if I run "singlethreaded" and Zope can still serve a few thousand requests a day thats really not bad. Oliver Erlewein -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net