使用C#连接时无法联系LDAP服务器 [英] LDAP server could not be contacted when connecting using C#

问题描述

我编写了以下代码以连接到LDAP服务器并验证用户凭据.

 public static string AuthFunction_One(string identity, string password, string containerString, string adServerName, bool useLDAPS, IdentityType identityType)
    {

        string failedString = "FAILED";
        string successString = "SUCCESS";
        string returnValue = failedString;
        try
        {
            PrincipalContext ctx = null;

            ctx = new PrincipalContext(ContextType.Domain, "ldap://localhost:10389/dc=example,dc=com", "uid=rish,dc=example,dc=com");

            UserPrincipal oUserPrincipal = UserPrincipal.FindByIdentity(ctx, identityType, identity);
            PrincipalSearchResult<Principal> oPrincipalSearchResult = oUserPrincipal.GetGroups();
            if (ctx.ValidateCredentials(identity, password))
            {
                return successString;
            }
            else
            {
                return failedString;
            }
        }
        catch (Exception ex)
        { 
            NLogHelper.GetInstance().Log("ADUtilityClass", "AuthFunction_One", NLog.LogLevel.Debug, "Error in function. Ex: " + ex.ToString());
            return failedString;
        }
    }

这引发了以下异常. >

This is throwing the below exception.

Exception: Exception thrown: 
'System.DirectoryServices.AccountManagement.PrincipalServerDownException' in System.DirectoryServices.AccountManagement.dll ("The server could not be contacted.")

当我尝试通过LDAP资源管理器进行连接时，它确实可以连接.以下是我在此处使用的配置.

userdn -> uid=rish,dc=example,dc=com
basedn -> dc=example,dc=com
password -> secret
servername -> localhost
port -> 10389
version -> 3

我在C#代码中做错了什么?任何帮助将不胜感激.

推荐答案

您好Rishanthan，

Hi Rishanthan,

根据您的描述，我创建了一个演示并从侧面再现了您的问题， PrincipalContext 与仅AD 一起使用效果很好.如果您的目录是OpenLDAP/其他目录，请尝试以下代码:

Based on your description, I create a demo and reproduce your issue on my side, it seems that PrincipalContext works well with AD only. If your directory is OpenLDAP/ any other, then try below code:

 try
 {
                LdapConnection ldapConnection;
                string ldapServer = "ldap://localhost:389/dc=example,dc=com";
                NetworkCredential credential = new NetworkCredential("username", "password", "domain"); 

                // Create the new LDAP connection
                ldapConnection = new LdapConnection(ldapServer);
                ldapConnection.Credential = credential;
                Console.WriteLine("LdapConnection is created successfully.");
            }
            catch (Exception e)
            {
                Console.WriteLine("\r\nUnexpected exception occurred:\r\n\t" + e.GetType() + ":" + e.Message);
}

或像这样使用DirectoryEntry:

Or use DirectoryEntry like this:

DirectoryEntry directoryEntry = new DirectoryEntry("LDAP://example.com", "username", "password");

最诚挚的问候，

吴可乐

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