Query on User Authentication aganist ADS

[apondu]

Hi

I have a query, i have put the code here.

I am using VS 2005, C#.Net.

This is working fine when i am install the Win OS 2003 with ADS, but

after few days it starts entering the exception and gives the message
"

Logon Failure : unknown user name or bad password"

I am a bit confused and want to know the reason for this.

Can someone help me and let me know the reason and solution for this

because i cann't reinstall the OS all the time.


// Start of Code


using (DirectoryEntry deDirEntry = new

DirectoryEntry( "LDAP://" + UserDomainTextB ox.Text,


UserNameTextBox .Text,


UserPassTextBox .Text,


AuthenticationT ypes.Secure))

try
{
string name = deDirEntry.Name .ToString();

MessageBox.Show ("Welcome to '" + deDirEntry.Name
+

"'");

}
catch (Exception exp)
{
MessageBox.Show ("Sorry, Invalid User");

}

// End of Code


Thanks for the help

Regards,
Govardhan