Question : Why are clients unable to login when one DC is powered off?

We are migrating our Windows 2003 servers to VMware and have built two new domain controllers / DNS servers to replace the old physical boxes. All FSMO roles have been transferred to the new DCs and they are GCs as well. As a pre-decommissioning test, we turned off one of the old DCs for a little while. When that DC is offline, clients cannot completely log in to the domain. Username and password appear to be accepted, but after that the desktop remains blank and the client appears to be totally unresponsive until the old DC is powered back on. Once that happens, the client completes the login process. We have even removed the old DC as a GC. DNS is Active Directory Integrated as well. Is there something else we should be doing? We don’t want to decommission the old DCs until we are sure that everything is functional.

Answer : Why are clients unable to login when one DC is powered off?

I added a 'return false' to the check.

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<html>
<head>
<script type="text/javascript">
function chkstr()
{
var Eml1=document.getElementById("eml1").value;
var Eml2=document.getElementById("eml2").value;

if(Eml1 != Eml2) {
	alert("Email addresses don't match.");
	return false;
	}
}
</script>
</head>
<body>
<h1>js-strcmp.html</h1>
<form action="#" method="get" onsubmit="return chkstr();">
<input type="text" name="eml1" id="eml1" value="Email 1" /><br />
<input type="text" name="eml2" id="eml2" value="Email 2" /><br />
<input type="submit" value="Submit" />
</form>

</body>
</html>