IIS denial of service

From: Arek Gondek (arek.gondek@mentec.ie)
Date: 07/20/01 

Date: 20 Jul 2001 10:55:49 -0000
Message-ID: <20010720105549.16001.qmail@securityfocus.com>
From: Arek Gondek <arek.gondek@mentec.ie>
To: focus-ms@securityfocus.com
Subject: IIS denial of service

Hi
Yesterday our server (Win2k and IIS) stopped
responding. The only way to recover was power it
down and boot again. In raptor firewall log file I found
the following notices:

1. httpd notice: An illegal character 0x18 was found at
position 6 in the request
2. Can't parse url (U\213\354\201\354\030\002)

Does anybody had similar problems before?
thanks
Arek