Office Web Apps Exception: “An item with the same key has already been added”

Artigo
04/07/2014

Scenario and Symptom:

An Office Web Apps 2013 server is talking to a SharePoint 2013 server and the following shows up in the ULS log (C:\ProgramData\Microsoft\OfficeWebApps\Data\Logs\ULS) of the OWA/WAC server:

03/14/2014 10:19:20.90 w3wp.exe (0x1CDC) 0x2854 Office Web Apps Office Web Apps common agq6x Exception WAC Server FrontEnd unhandled exception [0] System.ArgumentException: An item with the same key has already been added. at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at Microsoft.Office.Web.Apps.Environment.WacServer.WSConfigAdapter.TryGetValue[T](String settingName, T& value) at Microsoft.Office.Web.Apps.Common.WopiDocument.ValidateHostAndSetFileSource() at Microsoft.Office.Web.Apps.Common.WopiDocument..ctor(String fileRep, String accessToken, Int64 accessTokenTtl, String version, String sessionContext, WopiType wopiType) at Microsoft.Office.Web.Apps.Common.WopiDocument.IsValidWopiQueryString(String querySignature, BaseDocumentType docType, Boolean createDoc, BaseDocument& doc) at Microsoft.Office.Web.Apps.Common.WopiDocument.CreateFromQuerySignature(String querySignature) at Microsoft.Office.Web.Apps.Environment.WacServer.WSMainStorage.GetBaseDocumentFromContext(HttpContext context, String rawHostDocumentId) at Microsoft.Office.Web.Host.WacServer.WebWordViewer.WordViewerFrame.OnPreRender(EventArgs e) at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) StackTrace: at uls.native.dll: (sig=35ebf2aa-983a-4c4a-a61b-a0d5e84ac5d0|2|uls.native.pdb, offset=26E6A) at uls.native.dll: (offset=1F8A9) 29e37d01-8664-4b81-a916-bd4f92c34805

There aren't many good clues as to what key they're talking about and what item is already there.

Solution:

This problem may be caused by having duplicate entries in the allowlist for domains.

Check this ini file on the OWA/WAC server for duplicate entries: C:\ProgramData\Microsoft\OfficeWebApps\Data\FarmState\allowList.ini file

If there is a domain that is listed twice in there, that is probably the cause of this problem. But do not attempt to remove any duplicates from the .ini file.

As an alternative to opening the .ini file, you can run this PowerShell cmdlet: Get-OfficeWebAppsHost

More info:

https://technet.microsoft.com/en-us/library/jj219446(v=office.15).aspx

The Get-OfficeWebAppsHost cmdlet returns the list of host domains to which Office Web Apps Server allows file operations requests, such as file retrieval, metadata retrieval, and file changes. This list, known as the Allow List, is a security feature that prevents unwanted hosts from connecting to an Office Web Apps Server farm and using it for file operations without your knowledge.

The wildcard * is assumed for any domain that appears on the Allow List so that requests to all subdomains are also allowed. For example, if the domain contoso.com is on the Allow List, then Office Web Apps Server also allows requests to the domains corp.contoso.com and dev.contoso.com. Requests to other domains (such as fabrikam.com) are not allowed.

You can consider removing the duplicate using this cmdlet: Remove-OfficeWebAppsHost -Domain <String>

More info:

https://technet.microsoft.com/en-us/library/jj219453(v=office.15).aspx

The Remove-OfficeWebAppsHost cmdlet removes the specified host domain from the Allow List. The Allow List contains the host domains to which Office Web Apps Server allows file operations requests.

Root Cause:

In our case, we tripped an exception dump of the w3wp.exe process on the OWA server that served the Web Word Viewer while reproducing the problem.

Since psscor4.dll extension technically doesn't work for .net 4.5, and since this is technically .net 4.5 (even though it looks like 4.0), I loaded SOS.dll from C:\Windows\Microsoft.NET\Framework64\v4.0.30319 into windbg.exe while examining the memory dump.

!dae (dump all exceptions) showed these:

Exception Type : System.ArgumentException

Message: An item with the same key has already been added.

Exception Method Table: 000007FEF7EA1F08

Exception Object : 00000003FF8BE328

HResult: 80070057

InnerException: <none>

StackTrace:

000000001070DCD0 000007FEF8A5C70C System.Collections.Generic.Dictionary`2[[System.__Canon, mscorlib],[System.__Canon, mscorlib]].Insert(System.__Canon, System.__Canon, Boolean)

000000001070DD60 000007FE9982CAAC Microsoft.Office.Web.Apps.Environment.WacServer.WSConfigAdapter.TryGetValue[[System.__Canon, mscorlib]](System.String, System.__Canon ByRef)

000000001070DE10 000007FE99C61838 Microsoft.Office.Web.Apps.Common.WopiDocument.ValidateHostAndSetFileSource()

000000001070DEE0 000007FE99C613B0 Microsoft.Office.Web.Apps.Common.WopiDocument..ctor(System.String, System.String, Int64, System.String, System.String, Microsoft.Office.Web.Apps.Common.WopiType)

000000001070DF30 000007FE99C52A03 Microsoft.Office.Web.Apps.Common.WopiDocument.IsValidWopiQueryString(System.String, Microsoft.Office.Web.Common.EnvironmentAdapters.BaseDocumentType, Boolean, Microsoft.Office.Web.Common.EnvironmentAdapters.BaseDocument ByRef)

000000001070DFD0 000007FE99C61291 Microsoft.Office.Web.Apps.Common.WopiDocument.CreateFromQuerySignature(System.String)

000000001070E020 000007FE99C611EF Microsoft.Office.Web.Apps.Environment.WacServer.WSMainStorage.GetBaseDocumentFromContext(System.Web.HttpContext, System.String)

000000001070E060 000007FE99BF9F2A Microsoft.Office.Web.Host.WacServer.WebWordViewer.WordViewerFrame.OnPreRender(System.EventArgs)

000000001070E0E0 000007FEE2D4BCD1 System.Web.UI.Control.PreRenderRecursiveInternal()

000000001070E130 000007FEE2D6EDD9 System.Web.UI.Page.ProcessRequestMain(Boolean, Boolean)

Exception Type : System.Web.HttpUnhandledException

Message:

Exception Method Table: 000007FEE2EEF828

Exception Object : 00000003FF8BE738

HResult: 80004005

InnerException: