Exchange Admin Center 2013 SP1 worked for a day and then stopped working, possible OAB problems

Question

Here is a problem that has me confused. On a fresh Windows Server 2012 R2, I installed Exchange 2013 SP1. It was successful and for the first day everything was working well. I then installed all security updates. The next day, I could no longer log in to
the Outlook Web App or Exchange Admin Center. I get the generic "something went wrong" message, and the only details are X-FEServer: LAKEVIEW-SERVER (our server name). Nothing else. In the event viewer, I have the logs below every time I try to log
in. This is repeatable. Every time I attempt to log in the same 3 things appear in the Application Log.
Event 1003, MSExchange Front End HTTP Proxy [Oab] An internal server error occurred. The unhandled exception was: System.Configuration.ConfigurationErrorsException: Microsoft.Exchange.HttpProxy.ProxyModule,Microsoft.Exchange.FrontEndHttpProxy
does not implement IHttpHandlerFactory or IHttpHandler.    at System.Web.Configuration.HandlerFactoryCache.GetHandlerType(String type)    at System.Web.Configuration.HandlerFactoryCache..ctor(String type)    at System.Web.HttpApplication.GetFactory(String
type)    at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Event 4999, MSExchange Common Watson report about to be sent for process id: 2460 (IIS Worker Process, w3wp.exe), with parameters: E12IIS, c-RTL-AMD64, 15.00.0847.032, w3wp#MSExchangeOABAppPool, System.Web, S.W.C.HandlerFactoryCache.GetHandlerType,
S.Configuration.ConfigurationErrorsException, e0bc, 04.00.30319.34009. ErrorReportingEnabled: True
Event 1310, ASP.NET 4.0.30319.0 Event code: 3008 Event message: A configuration error has occurred. Event time: 5/8/2014 9:46:45 AM Event time (UTC): 5/8/2014 4:46:45 PM Event ID: 2c98a65728a7475db0212291e3934ab7
Event sequence: 19 Event occurrence: 9 Event detail code: 0   Application information:     Application domain: /LM/W3SVC/1/ROOT/OAB-1-130440407246522811     Trust level: Full     Application Virtual Path: /OAB
    Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\OAB\     Machine name: LAKEVIEW-SERVER   Process information:     Process ID: 2460 (IIS Worker Process, w3wp.exe)
    Process name: w3wp.exe     Account name: NT AUTHORITY\SYSTEM   Exception information:     Exception type: ConfigurationErrorsException     Exception message: Microsoft.Exchange.HttpProxy.ProxyModule,Microsoft.Exchange.FrontEndHttpProxy
does not implement IHttpHandlerFactory or IHttpHandler.    at System.Web.Configuration.HandlerFactoryCache.GetHandlerType(String type)    at System.Web.Configuration.HandlerFactoryCache..ctor(String type)    at System.Web.HttpApplication.GetFactory(String
type)    at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)    
Request information:     Request URL: https://localhost:443/OAB/     Request path: /OAB/     User host address: ::1     User:       Is authenticated: False     Authentication
Type:       Thread account name: NT AUTHORITY\SYSTEM   Thread information:     Thread ID: 18     Thread account name: NT AUTHORITY\SYSTEM     Is impersonating: False     Stack
trace:    at System.Web.Configuration.HandlerFactoryCache.GetHandlerType(String type)    at System.Web.Configuration.HandlerFactoryCache..ctor(String type)    at System.Web.HttpApplication.GetFactory(String type)   
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
My first guess is to reset the Outlook Address Book by using the Remove-OabVirtualDirectory Exchange commandlet. But I am not so sure this will work because Exchange worked for a day. Any help understanding what caused the problem (and thus help avoid it
happening again) and how to fix it are appreciated. Thanks.

Answer 1

hi,
If nothing works try resetting the Virtual Directories.
For  owa 
Open Exchange Management Shell (EMS), and then run the following cmdlet to change the authentication method of the "owa" virtual directory to Windows authentication:
set-Owavirtualdirectory -identity "MBX\owa (Exchange Back End)" -WindowsAuthentication $True -Basicauthentication $false
-Formsauthentication $false
Run the following command on both the Client Access and Mailbox servers to restart Internet Information Services (IIS):
iisreset /noforce
For  ECP
Start Windows PowerShell.
Type the following commands, and then press Enter after each line:
Add-PSSnapin *exchange*
Set-EcpVirtualDirectory -Identity "MBX\ecp (Exchange Back End)" -WindowsAuthentication $true -FormsAuthentication $false
Run the following command on both the Client Access and Mailbox servers to restart Internet Information Services (IIS):
iisreset /noforce
For Ref: http://technet.microsoft.com/en-us/library/bb123752(v=exchg.150).aspx
I did those commands. But remember, the original error I gave was related to the OAB virtual directory, not ECP or OWA. I also did the Remove-EcpVirtualDirectory, Remove-OabVirtualDirectory, and Remove-OwaVirtualDirectory commandlets and the corresponding
EcpVirtualDirectoryOabOwaVirtualDirecoty ones. I still cannot log in to the Exchange Admin Center. And I still have the same original generic unhelpful error message.
However, there are some changes. After I removed and re-added the virtual directories I no longer received the original error logs given above. I now get this log in the event viewer:
Event 2001, MSExchange Front End HTTP Proxy
[Owa] Failed to load SSL certificate.
The first logs I gave above always appeared after attempting to log in. This log that I gave appears infrequently and is not connected to any log in events. This log occurs only
after a similar log given below:
Event 1001, MSExchange Front End HTTP Proxy
[Owa] Application Starting.