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Change from Forms Authentication to Windows Authentication

Posted By:      Posted Date: September 04, 2010    Points: 0   Category :ASP.Net
What do I need to do in order to change an application from Forms Authentication to windows authentication?

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Windows Authentication doesn't work after change of admin pass



J have read many answers about

Login failed for user ''. The user is not associated with a trusted SQL server connection

error, but I don't want to mess up in my sql server so I want to be sure that what I do is OK.

Environment description:

In my company, we have our own application wchich we use to connect to database. All users use SQL Server Auth except me. I can log using Windows Auth from server and from my second computer.

Now everything works fine.

- My comp is in our domain 'OurDomian'.

- On server in AD is admin account 'SqlAdmin'.

- In MSSMS in Security->Logins there is account: OurDomian\SqlAdmin

- on my comp account OurDomian\SqlAdmin is added

I can log to sql server from  my comp using 'Integrated Security' in application with no problem.

Problem description:

Problem starts when I change SqlAdmin password on server.

When I connect from my comp I get the above error. But when I connect from server there is no problem.

I searcher application code and I don't think that I have to change somthing in it. Probably I have to change something with account and permissions.

1. Will it bee enough to delete and add again 'OurDomian\SqlAdmi

Change Password for Windows Authentication


Hello all,

I do not seem to be able to find even a yes no answer on this...

Using windows Authentication... is it possible to progrematically change a password?


I tried using several ways to do this. I tried using the ChangePassword  control. This tells me that minimun characters is 7 even though I have more then 7 characters... I also tried using this method:

            if (u.ChangePassword(TextBox2.Text, TextBox3.Text))
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        catch (Exception ex)
            LabelError.Text = "An exception occurred: " + Server.HtmlEncode(ex.Message) + "<BE>" + ex.ToString() + ". Please re-enter your values and try again.";


The user is always null... and I am assuming this is because this object is indended to use with Forms authentication.


All I want to do is have an option for users to change passwords. Is this possible with Windows Authentication?

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The question is:  Is it possible to specify both types of authentication (custom extension and windows) on the same instance, or do I have to use 2 instances, or use forms for both?

Thank you in advance,


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I've got it published to IIS with windows auth turned on and anonymous/forms/basic turned off.

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in web.config I have

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            <forms name=".Star" loginUrl="~/Login.aspx" protection="All" defaultUrl="~/Default.aspx" path="/" timeout="43200" cookieless="UseCookies" />     

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