Hi, it’s Adam Conkle again. Today I’d like to talk about an ADFS case I had recently where the customer ran into some limitations with their Federated WebSSO with Forest Trust setup. They had their environment set up similar to what is described in Read Adams complete post here

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Unable to add selected web part(s)

QueryListPart: A Web Part or Web Form Control on this page cannot be displayed or imported. The type could not be found or it is not registered as safe.

- Make sure the webpart is registered as safe in the web.config

- Make sure the assembly is accessible and in the bin folder

- Make sure the assembly name in the *.webpart definition file, matches the assembly name in the safe control element in web.config

- Make sure you don’t have more than one *.webpart file for the same web part in the web part catalog. This may happen if you changed the name of the *.webpart file.

- Restart IIS to start clean. Attach the debugger to the w3wp.exe process and try to load the page with the rogue web part. This way you can determine the exact location of the assembly you are loading.

- Check if the web part class exists by opening the assembly with reflector. This might sound funny, but in a bigger team, when different versions of assemblies are flying around it is very easy to overlook something and to use the wrong version, which so happens does not contain the web part class at all.

Thanks to http://www.mikhaildikov.com/

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Came accross an interesting solution on Linkedin to display most viewed Documents from a Document Library in a webpart. I havnt tried it myself but sounds like it would work:

1) Install LogParser on Web App Server (Sharepoint Index Server)

2) Setup a batch file with the LogParse query of your choice.
For example:
“C:\Program Files\Log Parser 2.2\logparser” -i:IISW3C -o:XML “SELECT TOP 10 REPLACE_CHR(cs-uri-stem,’+',’ ‘) AS sUrl, EXTRACT_FILENAME(cs-uri-stem) AS sName, EXTRACT_EXTENSION(cs-uri-stem) AS sExt, COUNT(*) AS [Total Hits] INTO MYFILE.XML FROM \\WFE1\C$\Windows\system32\LogFiles\W3SVC1\*.log, \\WFE2\C$\Windows\system32\LogFiles\W3SVC1\*.log WHERE TO_UPPERCASE(sUrl) Like ‘/SITES/SPECIALSITE%%’ AND TO_UPPERCASE( sExt ) IN (‘DOCX’;'PPTX’;'PNG’;'GIF’;'JPG’;'BMP’) AND TO_UPPERCASE(sUrl) Not Like ‘%%/_T/%%’ AND TO_UPPERCASE(sUrl) Not Like ‘%%/_W/%%’ GROUP BY sUrl,sName,sExt ORDER BY [Total Hits] DESC

3) This query code search only for some documents (docx, pptx, etc.) on the site ‘/sites/specialsite’ on the default web application and site collection W3SVC1. The logs are located on WFE1 and WFE2. The log parser result file is an XML file named MYFILE.XML.

4) Daily Schedule the execute of the batch and the upload of the xml file to a sharepoint document library

5) Create an XSLT file for presentation and upload to the sharepoint document library.

6) Finally show the XML with the XML WebPart with the xml and xslt files as the parameters.

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This error usually occurs in Sharepoint when the transaction log is full or no drive space available to it on the SQL server in your farm.

You will usually get the error when trying to create new content etc.

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