I deleted 150k+ spam bot registered users. I set Registration to None. No more new users = good.

Tons of errors in the log = bad. I'm truncating it nightly.

I'd like a way to redirect attempts to load UserProfile. (Because bots are loading the urls for non-existent users' profiles, causing errors).

I found the article below and made the following unsuccessful attempts below.

Any suggestions on how to get this working, or a different approach to take? 

<rewrite>

 <rules>

 <rule name="Fail bad requests">

 <match url="UserProfile/tabid/([0-9]+)/userId/([0-9]+)/Default.aspx"/>

 <conditions>

 <add input="{HTTP_HOST}" pattern="UserProfile/tabid/{R:1}/userId/{R:2}/Default.aspx" negate="true" />

 </conditions>

 <action type="AbortRequest" />

 </rule>

 <rule name="Redirect from User Profile">

 <match url="^UserProfile/tabid/([0-9]+)/userId/([0-9]+)/Default.aspx" />

 <action type="Redirect" url="/Default.aspx" redirectType="Found" />

 </rule>

 <rule name="User Profile Redirect" stopProcessing="true">

 <match url="(.*)" />

 <conditions logicalGrouping="MatchAny" trackAllCaptures="false">

 <add input="{HTTP_HOST}{REQUEST_URI}" pattern="UserProfile/tabid/{R:1}/userId/{R:2}/Default.aspx" />

 </conditions>

 <action type="Redirect" url="http://www.somesite.com/" />

 </rule>

 </rules>

 </rewrite>