Error 2436: Warning - An unrecognized HTTP response was received when attempting to crawl this item. Verify whether the item can be accessed using your browser.

This warning turned up in the Event viewer repeatedly for about 2 days.
It pointed to the SharePoint content cannot be crawled..that was worrying!

After much digging around on the server and also on the internet, I noticed several solutions were available which got me putting on my thinking cap.... Most of the solutions available werent related to this issue I was having. So I decided to dig a bit further..

Then I looked at the Error again.

Event Type: Warning
Event Source: Windows SharePoint Services 3 Search
Event Category: Gatherer 
Event ID: 2436
Date: 2/6/2012
Time: 1:33:07 PM
User: N/A
Computer: [SERVERNAME]
The start address cannot be crawled
Context: Application 'Search index file on the search server', Catalog 'Search'
Details: An unrecognized HTTP response was received when attempting to crawl this item. Verify whether the item can be accessed using your browser.   (0x80041204)

  1. Tried to access the Content Source URL and I got an error message 
  2. Then I looked into the Windows HOSTS file, I noticed that the HOSTS file had been modified recently.
  3. I removed the entry for the Content Source URL.
  4. Made changes to the proxy settings on the IE and that resolved the error message I was getting when I try to access the URL
  5. After that I noticed, the error did not return.

Blocking File Types in SharePoint 2007

Blocking File Types in SharePoint 2007 is an operational action.
You can decide to restrict certain file types depending on the configuration of your SharePoint Farm or the organisational policy.

Blocking some file types you restrict the upload or download of these files with the extension that has been blocked. Users will not be able to add these files to SharePoint.

For example, you might need to block file types "*.exe" to exclude possible virus files users might unknowingly add to your farm.

Certain file types are by default blocked in SharePoint 2007 and also these file types blocking are Web Application specific.

To block a file type or find the list of file types blocked.

Go to Central Admin > Operations > Security Configuration > Blocked file types

1. Select the Web Application you want to implement Blocked File Types
2. On the resulting page, add the extension file type.
3. Click OK to save.


Create Document Library Error: A duplicate name 'column name' was found

User tries to create a document library from a custom document library template and gets the following error
"A duplicate name 'Column name' was found".

- Client's SharePoint Site Admin deletes site.
- A backup of a similar site was taken and restored where the deleted old site existed.
- A new site now has been restored with all references to the site columns of the restored site.
- The document libraries restored does not have the content type activated.
- Once you activate the content type in the newly document libraries, it creates 2 columns of the same name one with the content type and one without the content type.

The problem was that the columns in the content type that has been applied to the document library template already exists with a different GUID. The existing columns was the one that was restored and it inherited a different GUID.


  1. Create a new Document Library, apply the content type required for the document template.
  2. Save it as a document library template using a different name.
  3. Delete the old document library template that was restored. 
  4. Rename the newly created document library template to the name of the one deleted.
Problem solved!