i had edited my default.config as web.config like below
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="yafnet" type="yaf.SectionHandler,yaf"/>
<section name="rewriter" type="Intelligencia.UrlRewriter.Configuration.RewriterConfigurationSectionHandler, Intelligencia.UrlRewriter" />
</configSections>
<yafnet configSource="yafnet.config"/>
<rewriter configSource="urlrewriter.config"/>
<system.web>
<httpModules>
<add type="Intelligencia.UrlRewriter.RewriterHttpModule,Intelligencia.UrlRewriter" name="UrlRewriter" />
</httpModules>
<globalization requestEncoding="utf-8" responseEncoding="utf-8"/>
<compilation defaultLanguage="c#" debug="false"/>
<pages enableEventValidation="false" validateRequest="false" smartNavigation="false"/>
<authentication mode="Forms">
<forms name=".YAFNET_Authentication" timeout="525600" />
</authentication>
<customErrors defaultRedirect="error.aspx" mode="RemoteOnly"/>
<!--trace enabled="true" pageOutput="true"/-->
<xhtmlConformance mode="Legacy"/></system.web>
</configuration>
and yafnet config file here below just 2 changes made anyother changes required
<yafnet>
<connstr>user id=sa;pwd=sharma123;data source=(local);initial catalog=YAF;timeout=90</connstr>
<uploaddir>~/upload/</uploaddir>
<boardid>1</boardid>
<!-- Enable URL Rewriting -->
<enableurlrewriting>false</enableurlrewriting>
<!--logtomail>email=hemant.yadav@sharmainfoway.com;server=smtpout.secureserver.net;user=hemant.yadav@sharmainfoway.com;pass=hemant123;</logtomail-->
<!--categoryid>1</categoryid-->
<!-- Enable these to use a custom user class "provider" -->
<!--CustomUserAssembly>TinyGecko.YAFIntegration.dll</CustomUserAssembly>
<CustomUserClass>TinyGecko.YAFIntegration.yafUserClass</CustomUserClass-->
</yafnet>
just 2 changes i have made in at time of installation any other changes required