Intermittent Authentication Error: 403 Forbidden

Some days back I have faced an Intermittent Authentication Error issue.

Issue:

Several users received a 403 Forbidden error when they try accessing the SharePoint site.  If they clear all IE cookies, they were able to log in one time but if they close and reopen the browser, they receive the 403 error again until they clear their IE cookies once more.  

After clearing the cookies, they were prompted for re authentication when attempting to open any MS Word documents as well and the document fails to open

Resolution:

Finally I have got below articles to get rid of this issue.

http://support.microsoft.com/kb/932118

http://support.microsoft.com/kb/2019105

No one is able to delete a particular document from a document library

One of the very fresh incidents I have gone through. In my SharePoint farm for a specific documents library No one is able to delete a particular document from a document library

Below steps are followed to resolve this issue:
I tried using my Farm Admin account but no luck
I have tried to delete this doc using STSADM, Powershell, content & structure, and even SharePoint manager. All of which error saying the document is checked out or locked by a user. I have also tried turning off the Force check out feature.
No luck

The odd thing is, that the document icon, does not show as though it is checked out. And the drop down menu only has "check out", but when you try that, you get an error stating the document was NOT checked out.

If you try to delete via explorer view, it pops right back up after a page refresh.

When I look at its properties in SharePoint manager, it shows the document as checked out to that same user, but it also shows that I checked it in via content & structure. So it also says the checkout status is "short term", but I waited until the lock "should have" expired, and tried to delete it again. But no luck, it just pushed out the lock expiration.

This library has hundreds of documents; to delete it and re-create it would not really be a possibility. I am able to upload new docs and delete them.

Resolution
Finally none of the above steps helped me to delete the document so I used SharePoint designer.
Opened the site in SharePoint Designer and just browsed to that document library, selected those documents and deleted it, which was deleted without a question.

Still I am in search how this happened !!

The document could not be opened for editing. A Windows SharePoint Services compatible application could not be found to edit the document.

This is very common issue with office documents.(Excel , Word)
Most of the time issue has been resolved by hot fixes provided by Microsoft
This issue I found with MS Office Project documents and this works for me.
Please follow below steps to resolve MS Office Project document compatibility issue with SharePoint


1. On the local computer, install Windows SharePoint Services Support from the Office installation media.(It is listed under Office Tools.)


2. The following registry keys must be added to the local machine.


[HKEY_CLASSES_ROOT\MSProject.Project]
@="Microsoft Office Project Document"


[HKEY_CLASSES_ROOT\MSProject.Project\CLSID]
@="{74B78F3A-C8C8-11D1-BE11-00C04FB6FAF1}"


[HKEY_CLASSES_ROOT\MSProject.Project\CurVer]
@="MSProject.Project.9"


[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App
Paths\Winproj.exe]
@="\"C:\Program Files\Softricity\SoftGrid for Windows Desktops\sfttray.exe" /launch
"Microsoft Office Project 2003 projecpm.311""
"UseUrl"="1"
"SaveUrl"="1"
--note that "Microsoft Office Project 2003 projecpm.311" refers to the actual name
of the package. The name will be different for every case.


[HKEY_CLASSES_ROOT\.mpp]
@="MSProject.Project.9"
"Content Type"="application/vnd.ms-project"
"SoftGridSource"="{C5F5D9DD-0FE3-4421-A2BE-F8203F53EAD9}"