The server could not be contacted

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public static bool ValidateActiveDirectoryLogin(string Domain, string Username, string Password)
{
	bool isValid = false;
	try
	{
		string ipAddress = "";
		if (Dns.GetHostAddresses(Dns.GetHostName()).Length > 0)
		{
			ipAddress = Dns.GetHostAddresses(Dns.GetHostName())[0].ToString();
		}

		//create a "principal context" - e.g. your domain (could be machine, too)
		//using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, Domain))
		using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, Domain, "DC=estagioit,DC=local"))
		{
			// validate the credentials
			isValid = pc.ValidateCredentials(Username, Password);
		}
	}
	catch (Exception ex)
	{
		isValid = false;
	}
	return isValid;

}

What I have tried:

public static bool ValidateActiveDirectoryLogin(string Domain, string Username, string Password)
{
	bool isValid = false;
	try
	{
		string ipAddress = "";
		if (Dns.GetHostAddresses(Dns.GetHostName()).Length > 0)
		{
			ipAddress = Dns.GetHostAddresses(Dns.GetHostName())[0].ToString();
		}
		using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, Domain, "DC=estagioit,DC=local"))
		{
			isValid = pc.ValidateCredentials(Username, Password);
		}
	}
	catch (Exception ex)
	{
		isValid = false;
	}
	return isValid;

}

Posted 19-Feb-19 22:19pm

Member 13944608

Updated 28-Aug-20 8:36am

TheRealSteveJudge

v3

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Comments

F-ES Sitecore 20-Feb-19 5:02am

There's obviously an issue with your client machine connecting to the target server. We can't inspect your network and we can't run your code in the context of your local machine so there's not much we can do to help.

Member 13944608 20-Feb-19 5:19am

ok thanks

Richard Deeming 20-Feb-19 7:46am

string ipAddress = "";
if (Dns.GetHostAddresses(Dns.GetHostName()).Length > 0)
{
    ipAddress = Dns.GetHostAddresses(Dns.GetHostName())[0].ToString();
}

That's two relatively expensive method calls, both called twice, to populate a variable which you never use. Was this meant to server a purpose other than slowing your code down?

2 solutions

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Dr.Walt Fair, PE · Answer 1 · 2019-03-10T07:50:00

Solution 1

When I've run into this problem it was always due to incorrectly specifying the server (ie. typo) or a firewall issue. Try dropping your firewall and see if it works.

Posted 10-Mar-19 7:50am

Dr.Walt Fair, PE

Updated 10-Mar-19 7:51am

v2

Member 10397150 · Answer 2 · 2020-08-28T08:36:00

Solution 2

So, BTW, this error message ("The server could not be contacted.") is the default for System.DirectoryServices.AccountManagement.PrincipalServerDownException. When you have established code running and it stops with this message in your logs - something on the network has changed.

Posted 28-Aug-20 8:36am

Member 10397150