OWA/ECP stop working after update ((

Copper Contributor

Mar 07, 2023

It's quite interesting. I tried to find events using the error or warning filter. It turned out that the event I was interested in was with the information level. Event code 1309. The source is ASP.NET 4.0.30319.0

Event code: 3005
Event message: An unhandled exception occurred.
Event time: 07.03.2023 21:20:45
Event time (UTC): 07.03.2023 18:20:45
Event ID: c51f5e3a06fc4aa8b569417c2d2cbc90
Event sequence: 2
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/2/ROOT/owa-4603-133226868366278403
Trust level: Full
Application Virtual Path: /owa
Application Path: C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\owa\
Machine name: EMAIL

Process information:
Process ID: 20032
Process name: w3wp.exe
Account name: NT AUTHORITY\system

Exception information:
Exception type: ArgumentException
Exception message: An element with the same key has already been added.
in System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
in System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoaderBase.InitializeLocalVersionFolders()
in Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoaderBase.Load()
at Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoader.Load()
in Microsoft.Exchange.Clients.Owa.Core.OwaApplicationBase.ExecuteApplicationStart(Object sender, EventArgs e)
in Microsoft.Exchange.Clients.Owa.Core.OwaModule.Init(HttpApplication context)
in System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr AppContext, HttpContext context, MethodInfo[] handlers)
in System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr AppContext, HttpContext context)
in System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr AppContext, HttpContext context)
in System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)



Request information:
Request URL: https://email.contoso.com:444/owa
Request path: /owa
User host address: my-ip-address
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\system

Thread information:
Thread ID: 63
Thread account name: NT AUTHORITY\system
Is impersonating: False
Stack trace: in System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
in System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoaderBase.InitializeLocalVersionFolders()
in Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoaderBase.Load()
in Microsoft.Exchange.Clients.Owa.Core.OwaSettingsLoader.Load()
in Microsoft.Exchange.Clients.Owa.Core.OwaApplicationBase.ExecuteApplicationStart(Object sender, EventArgs e)
at Microsoft.Exchange.Clients.Owa.Core.OwaModule.Init(HttpApplication context)
in System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr AppContext, HttpContext context, MethodInfo[] handlers)
in System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr AppContext, HttpContext context)
in System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr AppContext, HttpContext context)
in System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)


Custom event details:

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