Can't download files on Android from Server 2012 Essentials Remote Web Access

Question

I have two servers, one with Windows Server 2012 Essentials, and the other SBS 2011.  Employees like using Remote Web Access to log in from anywhere and have access to shared folders.  It works perfect on a Desktop computer, but when they try to
use their Android tablets or phones, and want to download a file (e.g. a PDF) from one of the shared folders on the server, the download fails.   When Microsoft was pushing 2012 they said RWA worked great on mobile devices, do I have to set up something
separately to make this happen?
I've completely disabled the firewall, and have ports 80,443,987, and 1723(just to be safe) all forwarded to the server.
I can log into the RWA site on the android, browse files and folders, but when I select a PDF to download, the download shows as if it's starting, shows in my android notification as if its going to start downloading (Shows MobileDownload www.mydomain.com)
but eventually after a few minutes, will time out and show "Download Unsuccessful".
Network connectivity is fine as I can do this on a Windows Desktop PC using any browser (Chrome, Firefox, IE) and successfully download anything I want.
UPDATE:  I found this in the event handler when I tried to download something from a mobile device...
- System
- Provider
[ Name] ASP.NET 4.0.30319.0
- EventID 1309
[ Qualifiers] 32768
Level 3
Task 3
Keywords 0x80000000000000
- TimeCreated
[ SystemTime] 2014-01-12T16:49:12.000000000Z
EventRecordID 72818
Channel Application
Computer MYSERVER.MYDOMAIN.local
Security
- EventData
3005
An unhandled exception has occurred.
1/12/2014 11:49:12 AM
1/12/2014 4:49:12 PM
953eedf1ad414391a193e5f98a281da5
263
3
0
/LM/W3SVC/1/ROOT/Remote-1-130340167702975633
Full
/Remote
C:\Program Files\Windows Server\Bin\WebApps\RemoteAccess\
MYSERVER
2592
w3wp.exe
NT AUTHORITY\NETWORK SERVICE
HttpException
Server cannot set content type after HTTP headers have been sent. at System.Web.HttpResponse.set_ContentType(String value) at System.Web.UI.Page.SetIntrinsics(HttpContext context, Boolean allowAsync) at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at Microsoft.WindowsServerSolutions.Web.RemoteAccessSite.RealPageHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
https://remote.MYDOMAIN.com:443/Remote/fs/MobileDownload.aspx?path=\\MYSERVER\PICTURES\2013603.jpg
/Remote/fs/MobileDownload.aspx
MY.IP.ADDRESS.141
MYDOMAIN\user
True
Forms
NT AUTHORITY\NETWORK SERVICE
31
NT AUTHORITY\NETWORK SERVICE
False
at System.Web.HttpResponse.set_ContentType(String value) at System.Web.UI.Page.SetIntrinsics(HttpContext context, Boolean allowAsync) at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at Microsoft.WindowsServerSolutions.Web.RemoteAccessSite.RealPageHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Answer 1

Hi,
Before going further, would you please let me confirm something firstly?
Would you please let me know if all Android devices
encounter this same issue? If you download different type files, will still this issue persists? You can upload a small file (such as a text file) to the share folder, then check if Android device can’t download it.
Based on your description, when logon a desktop computer, you will download files via RWA successfully. Please use the user account which logon computer to logon
the Android device, will still fail to download?
Please check if there has enough free space in Android devices that be used to save download.
When this issue occurred, please check the state of Android device in Dashboard. Besides, I suggest you should run the Best Practices Analyzer (BPA) and fix all
it can find. Then monitor the result.
Run the Windows Server 2012 Essentials Best Practices Analyzer
http://technet.microsoft.com/en-us/library/jj200181.aspx
In addition, regarding to the Event ID 1309, please refer to the following articles.
Event ID: 1309 Source: ASP.NET 4.0.30319.0
http://www.eventid.net/display-eventid-1309-source-ASP.NET%204.0.30319.0-eventno-11022-phase-1.htm
Hope this helps.
Best regards,
Justin Gu