LDAP Over SSL communication failing with Exception-"The user name or password is incorrect.\r\n"

Hi, 

I am facing issue while performing Directory Search with CROSS domains.  I have two different domains  DOMAIN100.LAB and  DOMAIN200.LAB . There is no TRUST relationship between these two domains. 

My app is running in DOMAIN100.LAB  and performing Directory search operation on   DOMAIN200.LAB .  The application able to bind with DC and able to access properties but Directory search failing with below exception. 

Note: It's working fine, if I set the TRUST relation between two domains DOMAIN100.LAB and DOMAIN200.LAB 

Exception msg: "The user name or password is incorrect.\r\n"

at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)

   at System.DirectoryServices.DirectoryEntry.Bind()

   at System.DirectoryServices.DirectoryEntry.get_AdsObject()

   at System.DirectoryServices.DirectorySearcher.FindAll(Boolean findMoreThanOne)

   at System.DirectoryServices.DirectorySearcher.FindAll()

   at ConsoleApp1.Program.Main(String[] args) in C:\Users\administrator.DRDOM450\source\repos\MyApp1\ConsoleApp1\Program.cs:line 229

Code : C# code from My app as below: for listing all DCs from Domain DOMAIN200.LAB

           string userName = "DOMAIN100\\administrator";
            string password = "Control123";

          string strDCName = "MYDC201.DOMAIN200.LAB";

            try
            {
                SearchResultCollection results = null;              
                DirectoryEntry deRootDSE =  new DirectoryEntry($"LDAP://{strDCName}/rootDSE", userName, password, AuthenticationTypes.SecureSocketsLayer );
                if (null != deRootDSE)
                {
                    string strPath = @"LDAP://" + deRootDSE.Properties["configurationNamingContext"].Value.ToString();
                    DirectoryEntry de = new DirectoryEntry(strPath, userName, password, AuthenticationTypes.SecureSocketsLayer);
                    if (null != de)
                    {
                        string []strPropList = { "name" };
                        DirectorySearcher searcher = new DirectorySearcher(de, "(objectcategory=server)", strPropList);
                        if (null != searcher)
                        {
                            results = searcher.FindAll();
                        }
                    }
                }
            }
            catch (Exception exxx)
            {
                Console.WriteLine($"exception {exxx.Message}");
            }

Please help to fix the issue.

Thanks & Regards 

Prasad