SQL Server 2014 SSRS Login Prompt won't go away

Hi,

I'm attempting to set up SQL Server Reporting Services on one of my environments.  The architecture is:

Database Server: SQL Server 2014 hosting my databases as well as the ReportServer / ReportServerTempDB databases
SSRS Server: SQL Server 2014 with just SSRS installed, hosting the web front end

I created a new SSRS database using the SSRS configuration manager.

When I log into the website on the local machine (http : // localhost/reports), I'm prompted for my credentials once and once I authenticate (domain\username), everything works as expected.  However, when I attempt to access the server remotely (either http or https : // reportserver.domain.com/reports) I'm prompted for my credentials at least 12 times.  If I keep re-entering them, the SQL Server Reporting Services Home folder/website will eventually re-appear, but if I try to navigate, I'm once again prompted for my credentials.

I did some research and verified that my AuthenticationTypes in the rsreportserver.config file was set to only RSWindowsNTLM.

Additional environment info: both servers are hosted on AWS, and we are using an ELB to access the SSRS webserver.  I'm using IE11 to attempt web access.

Thanks!