[DotNetDevelopment] IIS 7 giving Error 413

[i_robot73]

I've got a web application that saved progress data to a local DB;
though if anything gets large enough, I get Error 413 and a nice blown-
up app:

client Log:
ALL'/><RT ts='08:22:14.125' f='' id='305'
ev='UnloadSco'/></
RTL>
<RS
SS='unknown' CS='unknown' MS='1' NM='0' ED='194998'
/>
</RTD>
[08:22:18.906] ERROR - Server side error occurred when saving state
data, HTTP
response not 200 (OK). Status: 413

IIS Log:
2010-06-18 14:21:48 5.5.5.21 POST /scormengine/RecordResults.aspx
configuration&registration=CrsIdent%7cd369072081f04b42a72b8c58f1678b58!
VersionId%7c0!UsersIdent%7cUSER001!InstanceId
%7c0&isExitScormPlayer=true 443 - xxx.xxx.xx.xxx Mozilla/4.0+
(compatible;+MSIE+7.0;+Windows+NT+5.1;+.NET+CLR+1.1.4322;+.NET+CLR
+2.0.50727;+InfoPath.2;+.NET+CLR+3.0.04506.30;+.NET+CLR
+3.0.04506.648;+.NET+CLR+3.0.4506.2152;+.NET+CLR+3.5.30729) 413 0 0
2073

I have the site's 'Edit Request Filtering Settings\Allowed Content
Length' set to ~500MB in size.  What am I missing here?

Thanks!

David D.