Hi Friends, I am Ali, I got a error using with Form Based Authentication while connecting to Data Source in Report Builder 3.0 Error: An error has occurred during report processing. (rsProcessingAborted) Cannot impersonate user for data source 'Progress_Report'. (rsErrorImpersonatingUser) This data source is configured to use Windows integrated security. Windows integrated security is either disabled for this report server or your report server is using Trusted Account mode. (rsWindowsIntegratedSecurityDisabled) 1. My report server is configured with SharePonit integrated mode in windows authentication. using with Builder 3.0 i prepared reports and executed successesfully. 2. and I created new webapplication with FBA, and through Central admin-->manage application--> Users Policy added user with Full Control "Princial" that i have created in ASP.NET Users. Here in site library i added my reports that i have created previously. when i am going run the report got this error.( here i used SharPoint List Connection Type to connect lists) An error has occurred during report processing. (rsProcessingAborted) Cannot impersonate user for data source 'Progress_Report'. (rsErrorImpersonatingUser) This data source is configured to use Windows integrated security. Windows integrated security is either disabled for this report server or your report server is using Trusted Account mode. (rsWindowsIntegratedSecurityDisabled) 1. I tried to change credentials using with Username and Password( my local system name as "Admin" &"PWD") still data source not connecting. 2. How can i connect to Report Data source, ? i dont know how to run the reports under impersonation account instead of user account. is should i created new login in sql server as Principal and should add that user to GBA application data base? i struced with this last 4days, please any body explain me clearly Thanks & Regards AliMD.Liakath ali

Hi, To work around this issue you need to modify the data source to use stored credentials. Check the Link below. http://technet.microsoft.com/en-us/library/bb283152.aspx Hope it helps Regards, PS