Hi Danny

Have you tried looking in the /App_Data/Logs files to see if it reveals anything marked with ERROR or WARNING? How about the event viewer log on the webserver? (If you have access).

Preview should just work out of the box unless you have done some kind of customization of course.

/Jan

Did you ever resolve this Danny? I have a similar problem but Event viewer in Windows shows nothing.

The message is slightly different on mine:

500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed.

Umbraco version 7.4.3 assembly: 1.0.5948.18141

Here is the log it produced:

2016-07-20 12:55:49,110 [P3908/D5/T124] ERROR umbraco.DataLayer.SqlHelper`1[[System.Data.SqlServerCe.SqlCeParameter, System.Data.SqlServerCe, Version=4.0.0.1, Culture=neutral, PublicKeyToken=89845dcd8080cc91]] - Error executing query SELECT umbracoNode.Id,umbracoNode.Text, isNull(CMSDocument.Published,0) as Published, DocType.Text as nodeTypeName from umbracoNode Left Join cmsDocument ON umbracoNode.Id = cmsDocument.NodeId and Published = 1 INNER JOIN cmsContent ON umbracoNode.Id = cmsContent.NodeId INNER JOIN umbracoNode DocType ON cmsContent.contentType = DocType.Id and DocType.nodeObjectType = 'a2cb7800-f571-4787-9638-bc48539a0efb' INNER JOIN cmsContentType ON cmsContent.contentType = cmsContentType.NodeId WHERE (umbracoNode.nodeObjectType = 'c66ba18e-eaf3-4cff-8a22-41b16d66a972')AND umbracoNode.ParentId <> -20And cmsContentType.alias = @Alias And isNull(CMSDocument.Published,0) = @Published SqlCE4Umbraco.SqlCeProviderException: Error running Reader: SQL Statement: SELECT umbracoNode.Id,umbracoNode.Text, isNull(CMSDocument.Published,0) as Published, DocType.Text as nodeTypeName from umbracoNode Left Join cmsDocument ON umbracoNode.Id = cmsDocument.NodeId and Published = 1 INNER JOIN cmsContent ON umbracoNode.Id = cmsContent.NodeId INNER JOIN umbracoNode DocType ON cmsContent.contentType = DocType.Id and DocType.nodeObjectType = 'a2cb7800-f571-4787-9638-bc48539a0efb' INNER JOIN cmsContentType ON cmsContent.contentType = cmsContentType.NodeId WHERE (umbracoNode.nodeObjectType = 'c66ba18e-eaf3-4cff-8a22-41b16d66a972')AND umbracoNode.ParentId <> -20And cmsContentType.alias = @Alias And isNull(CMSDocument.Published,0) = @Published

Exception: System.Data.SqlServerCe.SqlCeException (0x80004005): The number of arguments specified for the function is not correct. [ Minimum argument count = 1, Maximum argument count = 1,Name of function(if known) = isNull ] at System.Data.SqlServerCe.SqlCeCommand.ProcessResults(Int32 hr) at System.Data.SqlServerCe.SqlCeCommand.CompileQueryPlan() at System.Data.SqlServerCe.SqlCeCommand.ExecuteCommand(CommandBehavior behavior, String method, ResultSetOptions options) at SqlCE4Umbraco.SqlCeApplicationBlock.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlCeParameter[] commandParameters) at SqlCE4Umbraco.SqlCeApplicationBlock.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlCeParameter[] commandParameters) at SqlCE4Umbraco.SqlCEHelper.ExecuteReader(String commandText, SqlCeParameter[] parameters) at umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) 2016-07-20 12:55:49,126 [P3908/D5/T124] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> umbraco.DataLayer.SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteReader ---> SqlCE4Umbraco.SqlCeProviderException: Error running Reader: SQL Statement: SELECT umbracoNode.Id,umbracoNode.Text, isNull(CMSDocument.Published,0) as Published, DocType.Text as nodeTypeName from umbracoNode Left Join cmsDocument ON umbracoNode.Id = cmsDocument.NodeId and Published = 1 INNER JOIN cmsContent ON umbracoNode.Id = cmsContent.NodeId INNER JOIN umbracoNode DocType ON cmsContent.contentType = DocType.Id and DocType.nodeObjectType = 'a2cb7800-f571-4787-9638-bc48539a0efb' INNER JOIN cmsContentType ON cmsContent.contentType = cmsContentType.NodeId WHERE (umbracoNode.nodeObjectType = 'c66ba18e-eaf3-4cff-8a22-41b16d66a972')AND umbracoNode.ParentId <> -20And cmsContentType.alias = @Alias And isNull(CMSDocument.Published,0) = @Published

Exception: System.Data.SqlServerCe.SqlCeException (0x80004005): The number of arguments specified for the function is not correct. [ Minimum argument count = 1, Maximum argument count = 1,Name of function(if known) = isNull ] at System.Data.SqlServerCe.SqlCeCommand.ProcessResults(Int32 hr) at System.Data.SqlServerCe.SqlCeCommand.CompileQueryPlan() at System.Data.SqlServerCe.SqlCeCommand.ExecuteCommand(CommandBehavior behavior, String method, ResultSetOptions options) at SqlCE4Umbraco.SqlCeApplicationBlock.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlCeParameter[] commandParameters) at SqlCE4Umbraco.SqlCeApplicationBlock.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlCeParameter[] commandParameters) at SqlCE4Umbraco.SqlCEHelper.ExecuteReader(String commandText, SqlCeParameter[] parameters) at umbraco.DataLayer.SqlHelper1.ExecuteReader(String commandText, IParameter[] parameters) --- End of inner exception stack trace --- at umbraco.DataLayer.SqlHelper1.ExecuteReader(String commandText, IParameter[] parameters) at SmartBlogLibraries.smartBlogManagement.GetAllDocuments(SearchTerm searchTerm) at SmartBlogLibraries.smartBlogManagement.showResults(EventArgs e) at SmartBlogLibraries.smartBlogManagement.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Hey all, did anyone ever find a solution to this issue? Apparently still an issue in 7.12.3 but this stopped working some time back for most of our sites and I don't recall when as we never internally use the Preview function. However, we have some editors asking about it so I thought I'd investigate.

Preview just displays a white page, no content returned. Here's what i know

• The index.html and index.htm are in the < files > area of web.config default docs, as others said this helped/worked. Not for us unfortunately
• Net tab is showing a 500 Internal Server Error
• No Umbraco logs are generated when I "Preview" a node
• I have toggled remove trailing slash requirements to no avail
• I have tested locally and non - no dice on any machine
• Enabled trace in web.config - this doesn't seem to do anything

It's a bit tough as I'm unable to show any logs or find a real reason why this is actually failing.

Any advice welcome.

Ok one last update, need a break from this..

I managed to get the Preview to throw a 403 instead of a 500 by enabling the Try Skip IIS (Developer -> Health Check).

Now I am receiving a 403 (permission denied). I attempted to use the last suggestion here https://our.umbraco.com/forum/umbraco-7/using-umbraco-7/74377-403-error-on-preview

But that results in a 404. I have checked IIS and ensured that index.html and index.htm are there. My App Pool is set to FULL trust, Anonymous authentication is set to use the application pool.

I'm actively logged in here, why would preview throw a 403?

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