I am getting this warning constantly on my CAS server.  I have two E2K13UR1 servers, a CAS and  Mailbox/HT server.  The error says that 'Unrecognized attribute 'maxUrlLength' is the issue.

Event code: 3008
Event message: A configuration error has occurred.
Event time: 7/7/2013 11:22:13 AM
Event time (UTC): 7/7/2013 3:22:13 PM
Event ID: 911f0704cb8d4eb58ab3b3bad1343e20
Event sequence: 1
Event occurrence: 1
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/1/ROOT/owa/Calendar-415-130176841335684504
    Trust level: Full
    Application Virtual Path: /owa/Calendar
    Application Path: C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa\
    Machine name: NJEDSNEXCAS01
 
Process information:
    Process ID: 3612
    Process name: w3wp.exe
    Account name: NT AUTHORITY\SYSTEM
 
Exception information:
    Exception type: ConfigurationErrorsException
    Exception message: Unrecognized attribute 'maxUrlLength'. Note that attribute names are case-sensitive. (C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa\web.config line 59)
 
Request information:
    Request URL: https://localhost:443/OWA/Calendar/HealthMailboxd149a5a9f976485eb8e92e48ad4c41f8@contoso.com/calendar/calendar.html
    Request path: /OWA/Calendar/HealthMailboxd149a5a9f976485eb8e92e48ad4c41f8@contoso.com/calendar/calendar.html
    User host address: 127.0.0.1
    User:  
    Is authenticated: False
    Authentication Type:  
    Thread account name: NT AUTHORITY\SYSTEM
 
Thread information:
    Thread ID: 5
    Thread account name: NT AUTHORITY\SYSTEM
    Is impersonating: False
    Stack trace:    at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
   at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)
   at System.Web.Configuration.RuntimeConfig.GetSectionObject(String sectionName)
   at System.Web.Configuration.RuntimeConfig.GetSection(String sectionName, Type type, ResultsIndex index)
   at System.Web.Configuration.RuntimeConfig.get_HttpRuntime()
   at System.Web.HttpRuntime.InitApartmentThreading()
   at System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags)
 
 
Custom event details:

Hello,

From the description, this is the iis issue.

For the event 1310, I recommend you refer to the following thread.

http://forums.iis.net/t/1121713.aspx/1

And I recommend you post your issue to the following forum. 

http://forums.iis.net/

Besides, I recommend you use server health and performance to check your exchange server.

Server Health and Performance

http://technet.microsoft.com/en-us/library/jj150551(v=exchg.150).aspx

If you have any feedback on our support, please click here

thank you for your reply.  For anyone else that happened on this page, my solution was not the above but rather to uninstall MS Exchange and IIS and then after the uninstall go through any references to Exchange (application.config, IIS applications), then reinstall.  It was definitely an Exchange issue where a new setup of Exchange piggy backs on existing configuration data (this was an existing Exchange server that I uninstalled).