Exchange 2013 CU5 - Outlook Web Access - Error 9646 with HTTP - No error with HTTPS

Hello everyone
i have a strange issue which i actually do not have an idea about what is going wrong.
- Exchange 2013 CU5
- SSL Offloading enabled - Virtual directories configured accordingly
When a user logs in to OWA via HTTP - after a while he sees the inbox but does not see any mail details.
He only sees "Error: Your request can't be completed right now. Please try again later."
After a while i also get an eventlog "9646" with too many open OWA sessions for that user.
Regardless which limit i set in the registry for this - the error does come back - even with 512 sessions allowed.
Working with HTTPS instead of HTTP then EVERYTHING works fine ... ?
Any idea on this?
Actually i am totally lost ...
Best regards
Jörg
Ihr zertifizierter VMware Partner Enterprise Solution Provider, IBM Advanced Partner, Datacore Partner, Microsoft Silver Partner / Solution Provider und Microsoft Small Business Partner. HEGO Informationstechnologie GmbH Telegrafenstrasse 8 D 42929 Wermelskirchen
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Hi,
Please confirm if the following features are added in your server manager:
•.NET framework 4.5 -> WCF Services -> HTTP Activation
•Windows process activation service -> Process model
•Windows process activation service -> Configuration APIs
If not, please add these features. Then ran IISReset \noforce from a Command Prompt window to restart IIS service. Also recycle Application Pools in IIS manager.
For more information about the IIS Prerequisites for Exchange 2013, please check the windows feature listed in the following article:
http://technet.microsoft.com/en-us/library/bb691354(v=exchg.150).aspx
Regards,
Winnie Liang
TechNet Community Support

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Date:          18/07/2014 10:00:37
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<System>
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Hi Off2work,
I've gone through the article and the Get-OutlookAnywhere commandlet looks fine (especially when compared with our working CAS).
Having looked through IIS I have spotted two additional misconfigurations with a missing setting to require SSL on the RPC folder and also the .NET version was not set.
I've now set those to Require SSL and .NET 2.0.5072 however this has made no difference following restarted of both 2007 CAS and 2013 servers.
I could potentially reinstall the CAS server or additionally decommission it as we have two of them and the other is not causing any errors with the 2013 server. This broken CAS server doesn't even have DNS records (except it's own hostname) or firewall
rules pointing to it, nor does it have any active client connections if I check with a quick netstat -a
As for UM, it's next on my list following some client/server connectivity testing so I have not yet assigned the SSL to the services or setup the dial plans, etc.
The services do start most of the time, but others then don't so it's not a consistent issue with just this service. On my current boot, the DAG Management service failed to start, but again I don't have a DAG implemented yet.
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BlackBerry Internet Service with Microsoft Outlook Web Access account

I need to switch my 8820 to a new work account. They use Outlook Exchange 2003, but do not support BES. I have access via both regular desktop Outlook and also Outlook Web Access (from a different server). I read the procedure to use BIS in KnowledgeBase KB03133. After entering my email address and password, I get a message that it was successfully set up. But, I get no e-mail messages delivered. When I check the settings, it looks like it is not using the correct server for Web Access. However, I can find no way to manually enter it - I don't get the error message described in Step 5 where I can pick "I will provide the settings." I try to set up via computer but I get a message that my BIS cannot be accessed via HTML and need to set up on my BB.
Any suggestions? Would it work with a newer phone running a newer OS? Do I need to check with AT&T if it supports Outlook Web Access? Thanks in advance.

Hi and Welcome to the Forums!
Lot's of possible variables...here a several other KBs to try:
KB03133How to integrate a Microsoft Outlook Web Access email address with a BlackBerry Internet Service account
KB18567BlackBerry Internet Service cannot connect to a Microsoft Outlook Web Access account using Microsoft Exchange 2007 or Microsoft Exchange 2010
KB15173Locate the mailbox name for a Microsoft Outlook Web Access 2007 email account
KB04804Error message appears when attempting to integrate a Microsoft Outlook Web Access 2010 account
KB02858Unable to integrate a Microsoft Outlook Web Access email address with a BlackBerry Internet Service account
The trick to getting to the manual settings screen is to provide your valid email address, but an incorrect password...then, it will allow you to manually enter the settings.
Good luck!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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Exchange 2013 CU5 - Outlook Web Access - Error 9646 with HTTP - No error with HTTPS

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