Hi, Did u enable the Intrusion Detection option in ISA. Then u may get some info regarding DOS attack. Also try to do port scan on ur ISA and find out ports opened and try to close unnecessary ports. If u find any suspicious Ip in ur logs then create packet filters to block the IP. Hope this helps. Vinay. -----Original Message----- From: mcse721@xxxxxxxxxxx [mailto:mcse721@xxxxxxxxxxx] Sent: Friday, May 31, 2002 5:06 AM To: [ISAserver.org Discussion List] Subject: [isalist] ISA server blocks access out to the internet and to the web site I host http://www.ISAserver.org My ISA server works fine then after one or two hours I have to reboot the ISA server and it works fine for a few then it happens again. People inside the network can not get out to the internet and the people trying to get to my web site are not able to access it. I have applied SP1 for the ISA server and SP2 for Windows 2000. Does anyone have any ideas that could help me please. I beleive it may be a DOS attack that is doing this I am just having a hard time trying to figure out how to stop the attacks and still have access to the internet and to the web site I am hosting. I have also checked the Event logs and have found nothing. Please anyone help me this is so frustrating. Mark ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: g.vinay@xxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')