Follow The below Steps... 1. Navigate the c:\inetpub\wwwroot\VirtualDirectories\[Your port Number] 2. Make a backup copy of web.config 3. Open web.config in some text editor , may be notepad Look for following tag , ensure enableSessionState="true" <pages asynctimeout="7" enablesessionstate="true" enableviewstate="true" enableviewstatemac="true" pageparserfiltertype="Microsoft.SharePoint.ApplicationRuntime.SPPageParserFilter, Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" validaterequest="false"> 4. Look for <httpmodules> tag and add below statement as last child node ( if not there already ) <add name="Session" type="System.Web.SessionState.SessionStateModule"> 5. Look for this tag below and update version to 10.0.0.0 <add name="ReportViewerWebControl" verb="*" path="Rese...
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