Reauthentication required for Office docs and Access Denied error message

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The scenario is :

I have installed SPPS on IIS6. And I have installed my ISAPI filter for
SPPS on IIS. This ISAPI filter requires Anonymous Authentication to be
turned on and it deploys basic over ldap and form over ldap
authentication schemes. I have also configured impersonation in a
wildcard extension dll. I have installed SPPS on "default web site" and
wild card extension is configured for this site.

The problem is:

When my ISAPI filter is on "web sites"

1) After succeefully authentication to SPPS, when I am trying to open
any MS office doc (e.g. .doc or .xls) I am again asked for my ISAPI
filter authentication. This doesnt happen with .txt or .pdf docs.

2) When I open sharepoint central admin site (site that gets created
under "web sites" when you install sharepoint) I am not able to access
the SPPS portal site. I get "Access denied" error message whenever I
click on any existing session links or open a new session. The central
admin site security is : it does not require Anonymous authentication
and IWA is turned on for this site.

3) After some time duration (there is no fixed time duration but
happens after every 1/2 days) when I am trying to access SPPS reaource
protected by my ISAPI filter, I am directly getting SharePoint "Access
Denied" message. Without prompting me for authentication. If I restart
IIS this starts working fine for another 1/2 days. (Once it worked for
3 days)

Problem 1 and 2 go away when I put my ISAPI filter on Default web site
instead of "web sites". I am not able to understand this behavior
especially with point number 1.

Regarding the third issue is there any application pool setting I need
to do? Is there any way I can debug this more effectively? If I remove
my ISAPI filter then I get the same SPPS access denied message so what
I am suspecting is after some time IIS doesnt recognize my ISAPI
filter. IIS is configured to run in worker process isolation mode.

Thanks in advance,
Ganesh

.

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