Reporting Services 2005: Report Image missed

If a report generated by URL like:
http://local_host/reportserver?/myreportpath/myreport&rs:Command=render

open this page from IE, if the report has some images inside, they might lost.

if check the image property, the image url might be:
http://local_host/reportserver/Reserved.ReportViewerWebControl.axd?ExecutionID=rfya3z2fwdlbzfvwudmikfq1&ControlID=158feba3-730b-4235-9caf-32219d427036&Culture=1033&UICulture=9&ReportStack=1&OpType=ReportImage&StreamID=78ce3977-0e12-4cf3-a731-ef643359c355

but if you open it in FireFox, it will show there!

here is the solution:
open report server database, fird the table of configurationinfo, change enablesessioncookie to false.

the resaon is if the server name include a "-" or "_", IE session will not contain it properly.

it works!