Then probably something has changed with the domain account that you use for authentication. Perhaps the password has expired or the account has been deleted or disabled.<div><br></div><div>But to be sure - what version of SQL Server?<br>
<br><div class="gmail_quote">On Wed, Nov 17, 2010 at 9:54 AM, Jacinta Gugu <span dir="ltr">&lt;<a href="mailto:jess.gugu@gmail.com">jess.gugu@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<span style="background-color:rgb(51, 51, 255)">SQLState:2800</span><br style="background-color:rgb(51, 51, 255)"><span style="background-color:rgb(51, 51, 255)">SQL Server Error:18456</span><div><div></div><div class="h5">
<br><br><div class="gmail_quote">
On Wed, Nov 17, 2010 at 9:51 AM, Rad! <span dir="ltr">&lt;<a href="mailto:conradakunga@gmail.com" target="_blank">conradakunga@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex">

what error are you getting?<br><br><div class="gmail_quote"><div><div></div><div>On Wed, Nov 17, 2010 at 9:49 AM, Jacinta Gugu <span dir="ltr">&lt;<a href="mailto:jess.gugu@gmail.com" target="_blank">jess.gugu@gmail.com</a>&gt;</span> wrote:<br>

</div></div><blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><div><div></div><div>
what can cause machines to failure to use their windows authentication.  <br>The machines are on the domain... and they have been working perfectly for a long time ... but today all of them are failing to use the authentication.....<br>



The domain is working well<br><div style="display:inline"></div>
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