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I do not have the option for form Authentication in IIS Manager under IIS=>Authentication. I do have the following options:

1)Anonymous Authentication 2)ASP.NET Impersonation 3)basic Authentication

according to this, forms Authentication is needed to provide for an application

please help me to fix it.

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When clicking on the site name in the left tree of IIS Manager do you see the three sections 'ASP.NET', 'IIS' and 'Management' in the middle? –  Peter Hahndorf Mar 2 '13 at 8:06
    
@peter:yes it have 3 sections –  Gomathipriya Mar 2 '13 at 8:15
    
hmm, open the file: C:\Windows\System32\inetsrv\config\administration.config in the second block of the moduleProviders node, do you have a FormsAuthentication entry? –  Peter Hahndorf Mar 2 '13 at 8:34
    
No, I couldn't find it in modules –  Gomathipriya Mar 4 '13 at 4:02

1 Answer 1

One thing you could try:

Make a backup of 'C:\Windows\System32\inetsrv\config\administration.config'.

In

<moduleProviders>

find the line

<add name="Impersonation" type="Microsoft.Web...

and make a copy of it just below, then replace 'ImpersonationModuleProvider' with 'FormsAuthenticationModuleProvider' in the new line.

further down in the file in the section:

<location path=".">
    <modules>

check whether there is an entry:

<add name="FormsAuthentication" />

and if not, add it.

I don't know whether this will fix your problem or why these entries are missing in the first place. But it is worth a try.

Otherwise I would re-install IIS.

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