C# Active Directory:无法使用DirectorySearcher联系服务器

我不断收到错误无法联系服务器。当我尝试运行代码时：

我搜索了几个小时，仍然无法联系服务器

DirectorySearcher directorySearcher = new DirectorySearcher();
string path = directorySearcher.SearchRoot.Path;
DirectoryEntry directoryEntry = new DirectoryEntry(path);

PrincipalContext pricipalContext = new PrincipalContext(ContextType.Domain, "LDAP://domain.dk/DC=domain,DC=dk");
//GroupPrincipal group = GroupPrincipal.FindByIdentity(pricipalContext, "(CN=" + department + ")");
GroupPrincipal group = GroupPrincipal.FindByIdentity(pricipalContext, "(CN=" + department + ")");


if (group != null)
{
    foreach (Principal principal in group.Members)
    {
        UserPrincipal tu = principal as UserPrincipal;

        DirectoryEntry de = tu.GetUnderlyingObject() as DirectoryEntry;
        var store = de.InvokeGet("physicalDeliveryOfficeName").ToString();
        var storeNumber = de.InvokeGet("description").ToString();

        employees.Add(new AdEmployees() { name = principal.Name, phone = tu.VoiceTelephoneNumber, email = tu.EmailAddress, store = store.ToString(), storeNumber = storeNumber.ToString(), link = GenerateLink(principal.Name) });
    }
}

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注意：我将广告所在的域更改为域

这里的关键语句似乎是“我将广告所在的域更改为域。”

确保应用程序服务器指向正确的DNS服务器

确保客户端指向正确的DNS服务器

此连接字符串看起来错误：

PrincipalContext PrincipalContext=new PrincipalContext（ContextType.Domain，“LDAP://Domain.dk/DC=Domain，DC=dk”）

#3中的连接字符串可能工作得更好，如下所示：

PrincipalContext PrincipalContext=新PrincipalContext（ContextType.Domain，“Domain”，“DC=Domain，DC=dk”）