Unable to login to Report Service on Windows 2008 R2 server

Question

I have reporting services installed on a Windows 2008 R2 server, When I make and RDP connection to the server and go to http://servername/Reports everything works fine. When I try to connect from another client to the web service, it asks for username and
password. it fails 3 times and the shows a blank page.
When I see the Event Viewer in the server (Windows Logs --> Security, I can see an Audit Failure:
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          9/4/2014 11:46:25 AM
Event ID:      4625
Task Category: Logon
Level:         Information
Keywords:      Audit Failure
User:          N/A
Computer:      MI-SWACO-DB.houston.livequest.net
Description:
An account failed to log on.
Subject:
    Security ID:        NULL SID
    Account Name:        -
    Account Domain:        -
    Logon ID:        0x0
Logon Type:            3
Account For Which Logon Failed:
    Security ID:        NULL SID
    Account Name:        Administrator
    Account Domain:        HOUSTONLQ
Failure Information:
    Failure Reason:        An Error occured during Logon.
    Status:            0xc000035b
    Sub Status:        0x0
Process Information:
    Caller Process ID:    0x0
    Caller Process Name:    -
Network Information:
    Workstation Name:    MI-SWACO3
    Source Network Address:    -
    Source Port:        -
Detailed Authentication Information:
    Logon Process:        
    Authentication Package:    NTLM
    Transited Services:    -
    Package Name (NTLM only):    -
    Key Length:        0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
    - Transited services indicate which intermediate services have participated in this logon request.
    - Package name indicates which sub-protocol was used among the NTLM protocols.
    - Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" />
    <EventID>4625</EventID>
    <Version>0</Version>
    <Level>0</Level>
    <Task>12544</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8010000000000000</Keywords>
    <TimeCreated SystemTime="2014-09-04T16:46:25.247229500Z" />
    <EventRecordID>8917</EventRecordID>
    <Correlation />
    <Execution ProcessID="504" ThreadID="1344" />
    <Channel>Security</Channel>
    <Computer>MI-SWACO-DB.houston.livequest.net</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="SubjectUserSid">S-1-0-0</Data>
    <Data Name="SubjectUserName">-</Data>
    <Data Name="SubjectDomainName">-</Data>
    <Data Name="SubjectLogonId">0x0</Data>
    <Data Name="TargetUserSid">S-1-0-0</Data>
    <Data Name="TargetUserName">Administrator</Data>
    <Data Name="TargetDomainName">HOUSTONLQ</Data>
    <Data Name="Status">0xc000035b</Data>
    <Data Name="FailureReason">%%2304</Data>
    <Data Name="SubStatus">0x0</Data>
    <Data Name="LogonType">3</Data>
    <Data Name="LogonProcessName">
    </Data>
    <Data Name="AuthenticationPackageName">NTLM</Data>
    <Data Name="WorkstationName">MI-SWACO3</Data>
    <Data Name="TransmittedServices">-</Data>
    <Data Name="LmPackageName">-</Data>
    <Data Name="KeyLength">0</Data>
    <Data Name="ProcessId">0x0</Data>
    <Data Name="ProcessName">-</Data>
    <Data Name="IpAddress">-</Data>
    <Data Name="IpPort">-</Data>
  </EventData>
</Event>
The firewall is OFF in both client and server.
I saw a similar question and the answer is related to firewall which is not may case.

Answer 1

Hi Mario,
According to your description, when you try to access the Report Manager in another client, a login dialog prompt. After typing a valid username and password 3 times, a blank page displays.
Generally, the issue is always caused by the Report Server is configured to use Kerberos authentication, while the Service Principal Name(SPN) is not configured correctly. To fix this issue, please refer to the following methods:
Register an SPN for the Report Server service under the domain user account.
Change the service account to run under a built-in account such as Network Service.
Remove RSWindowsNegotiate and ensure RSWindowsNTLM is specified in the rsreportserver.config file.
Besides, the issue can also be caused by the Internet Explorer (IE) didn't pass the user's credential to the Report Server automatically or the IE is not Windows Integrated enabled. For more detail steps about how to address this issue, please refer to the
following steps:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/184c4f6c-b292-4f9a-beca-80b70f4392fe/report-manager-prompts-3-or-4-times-for-usernamepassword-before-letting-users-in?forum=sqlreportingservices
Reference:
Resolving Kerberos Authentication Errors When Connecting to a Report Server
Solving the Reporting Services Login issue in the February CTP of SQL Server 2008
If there are any other questions, please feel free to ask.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support