Sharepoint 2010 SQl 2008 r2 Reporting Services Integrated with Claims

Question

i have a 4 server sharepoint 2010 farm all servers are windows 2008 r2 x64
two severs are sharepoint app/wfe servers
one server is SQL sharepoint content db server sql 2008 r2 enterprise
one server is SQL Claims Provider DB and reporting services on SQL 2008 r2
the site is behind a forefront tmg proxy firewall for both internal and external users and both locations are producing the same results.
the web application i am having an issue with consists of a primary web app claims enabled web app that only has NTLM enabled, with an extended extranet webapp that  supports claims and NTLM.
there is surrently a site collection that has been configured for reporting services when i log into the site as a SQL Claims user i am able to run the reportbuilder as a content type  using the New Report builder report content type from a library on
this site. Reportbuilder launches and i am once gain prompted to login i login with the same credentials i used to log into the site and reportbuilder opens up and then i am able to open datasourceas and reports.
When i log in to the same site collection as a domain user i am able to log in to the site and launch reportbuilder. When reportbuilder opens up i am prompted to log in, i insert my domain\username and password and nothing happens the login prompt appears again
blank on the back end it throws the following exceptions
1. Password check on 'username' generated exception: 'System.ServiceModel.FaultException`1[Microsoft.IdentityModel.Tokens.FailedAuthenticationException]: The security token username and password could not be validated. (Fault Detail is equal to Microsoft.IdentityModel.Tokens.FailedAuthenticationException:
The security token username and password could not be validated.).'.
2.An exception occurred when trying to issue security token: The security token username and password could not be validated.
any thoughts on where i should begin troubleshooting this.

Answer 1

I think i am getting close i am now seeing a new error it seems that the sp farm account is unable my domain account when launching reportbuilder.
vent code: 4006
Event message: Membership credential verification failed.
Event time: 4/6/2014 10:59:05 AM
Event time (UTC): 4/6/2014 2:59:05 PM
Event ID: 7640af98dab846829f78e7d74a4e1e8a
Event sequence: 9
Event occurrence: 8
Event detail code: 0
Application information:
    Application domain: /LM/W3SVC/2/ROOT/SecurityTokenServiceApplication-1-130412687342754349
    Trust level: Full
    Application Virtual Path: /SecurityTokenServiceApplication
    Application Path: C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\WebServices\SecurityToken\
    Machine name: (SP WFE MACHINE NAME)
Process information:
    Process ID: 8044
    Process name: w3wp.exe
    Account name: (SP FARM ACCOUNT)
Request information:
    Request URL:  
    Request path:  
    User host address:  
    User:  
    Is authenticated: False
    Authentication Type:  
    Thread account name: (SP FARM ACCOUNT)
Name to authenticate: (doamin account launching reportbuilder)
Custom event details: