Custom XSL Web Part Error – Access Denied

Scenario:

I created a custom XSL style sheet for a library web part that would intermittently throw an error for everyone except the admin account (me).

Every morning users were complaining about an error on the web part. I would sign in and try to replicate, but it always worked for me. Then when I’d ask the user to refresh their page and miraculously the error would go away.

Error

ULS logs contained the following information:

SPSecurityContext: Could not retrieve a valid windows identity for username ‘domain\user’ with UPN ‘user@domain.local’. UPN is required when Kerberos constrained delegation is used. Exception: System.ComponentModel.Win32Exception (0x80004005): Access is denied Server stack trace:
 at System.ServiceModel.Channels.AppContainerInfo.GetCurrentProcessToken()
 at System.ServiceModel.Channels.AppContainerInfo.RunningInAppContainer()
 at System.ServiceModel.Channels.AppContainerInfo.get_IsRunningInAppContainer()
 at System.ServiceModel.Channels.PipeSharedMemory.BuildPipeName(String pipeGuid)
 at System.ServiceModel.Channels.PipeSharedMemory.get_PipeName()
 at System.ServiceModel.Channels.PipeConnectionInitiator.GetPipeName(Uri uri, IPipeTransportFactorySettings transportFactorySettings)
 at System.ServiceModel.Channels.NamedPipeConnectionPoolRegistry.NamedPipeConnectionPool.GetPoolKey(EndpointAddress address, Uri via)
 at System.ServiceModel.Channels.CommunicationPool`2.TakeConnection(EndpointAddress address, Uri via, TimeSpan timeout, TKey& key)
 at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout)
 at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout)
 at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
 at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
 at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
 at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel, TimeSpan timeout)
 at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade)
 at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
 at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
 at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
 at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown
 at [0]:
 at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
 at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
 at Microsoft.IdentityModel.WindowsTokenService.S4UClient.IS4UService_dup.UpnLogon(String upn, Int32 pid)
 at Microsoft.IdentityModel.WindowsTokenService.S4UClient.CallService(Func`2 contractOperation)
 at Microsoft.SharePoint.SPSecurityContext.GetWindowsIdentity().
No windows identity for “domain\user”.

Root cause:

The SharePoint site’s application pool was configured to recycle every morning at 3:00 AM. This would clear cached authentication, and due to permissions, the XSL style sheet could not be accessed until the administrator logged in.

In addition, according to Hemendra’s response in this post, this can also be caused by an anonymous cache bug.

Solution:

Option 1: Remove auto-recycle settings on the application pool. (The error will re-appear if the site is manually recycled or the server reboots.)

Option 2 (recommended): Create two separate XSL files. The first file will be attached to the web part and, using the xsl:import element, will reference a second XSL file that contains your view styles.

XSL File #1 – Reference.xsl (linked in the Web Part Properties):

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:import href="/SiteAssets/Style.xsl"/>

<xsl:template match="/">
<xsl:apply-imports/>
</xsl:template>

</xsl:stylesheet>

xsllink

XSL File #2 – Style.xsl (contains view styles):

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
<html>
<body>
<h2>My CD Collection</h2>
<table border="1">
<tr bgcolor="#9acd32">
<th>Title</th>
<th>Artist</th>
</tr>
<tr>
<td><xsl:value-of select="catalog/cd/title"/></td>
<td><xsl:value-of select="catalog/cd/artist"/></td>
</tr>
</table>
</body>
</html>
</xsl:template>

</xsl:stylesheet>

NOTE: Save your XSL files in a library where Everyone has at least Read permissions.

Chart Web Part – SharePoint 2013

In SharePoint 2010, there was a Chart Web Part that you could connect to another web part on the same page, to a list anywhere in the site collection, to an external content type, or to data from an Excel workbook.

In SharePoint 2013, this does not exist OOB.

However, if you copy and paste this code and save it as an XML file, you can upload it and use it in 2013!


<?xml version="1.0" encoding="utf-8"?>
<webParts>
<webPart xmlns="http://schemas.microsoft.com/WebPart/v3">
<metaData>
<type name="Microsoft.Office.Server.WebControls.ChartWebPart,microsoft.office.server.chart,Version=14.0.0.0,Culture=neutral,PublicKeyToken=71e9bce111e9429c" />
<importErrorMessage>Cannot import Chart Web Part.</importErrorMessage>
</metaData>
<data>
<properties>
<property name="Title" type="string">Chart Web Part</property>
<property name="Description" type="string">Helps you to visualize your data on SharePoint sites and portals.</property>
</properties>
</data>
</webPart>
</webParts>

Navigate to the page you where you want to add a chart and go into edit mode.

Click the insert tab and select Web Part.

Click “Upload a Web Part” and browse to the XML file you saved from the code above.

Click Upload.

chart

The page will refresh so you’ll have to go back into the Web Part menu to select the Chart Web Part from the Imported Web Parts category.

chartwebpart.PNG

Click Add and voila!

chartwebpart1.PNG

Save the page before you click on the Data & Appearance or Advance Properties links.