Hi Ben, I am indeed using XP SP2.
------------------------- Some more info : ------------------------- 1) I have checked on the event viewer and I have not seen the event 4226 while I have run the code sample above. 2) I can still see this error (4226) recently In the log so that I must have bumped against this limit trying to put pull this out. 3) I have installed today process explorer (from sysinternals). I am not completly used to it but you can have a look at the TCP/IP connections opened by the processes. It appears that I have alwyas 10 connections opened (and the IP adresses progress durning the scan from Ip adresse 192.168.3.1 -> 254). 4) Besides I also run on the same PC angry Ip scanner 2.21. Checking using ethereal the arp request are all dispatched quit quickly (see my mail above). ------------------------ NEW RESULT : ----------------------- Something is limiting the TCP/IP connections from my python program at 10 maximum at the same time. I do not see this limit in my code. I did not bumped over the 4226 error. => Where does this limit come from. => How can I overcome it. Thanks for the advice anyway. Sebastien. Ben Sizer wrote: > seb wrote: > > I need to write a scanner that test all the IP adresses that repond on > > a given port. > ... > > I am using winXP pro on a 2GHZ P4 and 512 Mo. > > If you have XP Service Pack 2, it cripples port-scanning as part of a > 'security' fix. Broadly speaking, it limits the rate at which you can > make connections at the OS level; this will show up as event 4226 in > the Event Viewer if it affects you. > > -- > Ben Sizer -- http://mail.python.org/mailman/listinfo/python-list
