IIS Access Violation for Polygon with More Than 100 Vertices

• Microsoft Internet Information Server versions 2.0 and 3.0

SYMPTOMS

Internet Information Server (IIS) may experience an access violation when it processes client response coordinates for a server side Image Map. The access violation will occur if the region selected is a Polygon with more than 100 vertices defined.

CAUSE

IIS defines enough space to store 100 vertices for a polygon region; therefore, if more than 100 vertices exist in the image map, IIS attempts to process the additional vertices. An access violation then occurs when the limit of 100 vertices is exceeded.

RESOLUTION

IIS has been modified to allow 160 vertices and ignore any polygon region defined with more than 160 vertices.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Internet Information Server versions 2.0 and 3.0. This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

   S E R V P A C K