SSRS cant open report builder - authentication error

Hi Experts,

I hope you can help me with this?

I recently built and SQL Server Reporting Service. All was working fine, but i needed it to work over HTTPS. Unfortunately when attempting to browse HTTPS it kept prompting me for credentials, but would not accept any (this is despite me being an administrator, sysadmin and explicitly referenced as a SSRS administrator

I did some googling and found you could change the manor of authentication via the following link

https://technet.microsoft.com/en-us/library/cc281309(v=sql.105).aspx

I was able to change authentication to basic and it worked. i could use HTTPS and login with my credentials. But now i've hit a new snag. Now when ever i open the report builder i get the following error

"Cannot retrieve application. Authentication error"

Details revel the following

"PLATFORM VERSION INFO
      Windows                   : 6.1.7601.65536 (Win32NT)
      Common Language Runtime       : 4.0.30319.18444
      System.Deployment.dll             : 4.0.30319.34244 built by: FX452RTMGDR
      clr.dll                   : 4.0.30319.18444 built by: FX451RTMGDR
      dfdll.dll                   : 4.0.30319.34244 built by: FX452RTMGDR
      dfshim.dll                   : 4.0.41209.0 (Main.041209-0000)

SOURCES
      Deployment url                  : http://dc4insql01/ReportServer/ReportBuilder/ReportBuilder_3_0_0_0.application

ERROR SUMMARY
      Below is a summary of the errors, details of these errors are listed later in the log.
      * Activation of http://dc4insql01/ReportServer/ReportBuilder/ReportBuilder_3_0_0_0.application resulted in exception. Following failure messages were detected:
            + Downloading http://dc4insql01/ReportServer/ReportBuilder/ReportBuilder_3_0_0_0.application did not succeed.
            + The remote server returned an error: (401) Unauthorized.

COMPONENT STORE TRANSACTION FAILURE SUMMARY
      No transaction error was detected.

WARNINGS
      There were no warnings during this operation.

OPERATION PROGRESS STATUS
      * [28/08/2015 08:34:46] : Activation of http://dc4insql01/ReportServer/ReportBuilder/ReportBuilder_3_0_0_0.application has started.

ERROR DETAILS
      Following errors were detected during this operation.
      * [28/08/2015 08:34:46] System.Deployment.Application.DeploymentDownloadException (Unknown subtype)
            - Downloading http://dc4insql01/ReportServer/ReportBuilder/ReportBuilder_3_0_0_0.application did not succeed.
            - Source: System.Deployment
            - Stack trace:
                  at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
                  at System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
                  at System.Deployment.Application.FileDownloader.Download(SubscriptionState subState)
                  at System.Deployment.Application.DownloadManager.DownloadManifestAsRawFile(Uri& sourceUri, String targetPath, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
                  at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
                  at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
                  at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
                  at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
            --- Inner Exception ---
            System.Net.WebException
            - The remote server returned an error: (401) Unauthorized.
            - Source: System
            - Stack trace:
                  at System.Net.HttpWebRequest.GetResponse()
                  at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)

COMPONENT STORE TRANSACTION DETAILS
      No transaction information is available."

This is the authentication string i am using currently. Any ideas?

<Authentication>
            <AuthenticationTypes>
                         <RSWindowsBasic>
                               <LogonMethod>3</LogonMethod>
                               <Realm></Realm>
                               <DefaultDomain>mydomain</DefaultDomain>
                         </RSWindowsBasic>
                  </AuthenticationTypes>
                  <EnableAuthPersistence>true</EnableAuthPersistence>
      </Authentication>