C# LDAP SetPassword throws The RPC server is unavailable - c#-4.0

Question

I am trying to create a new user -> set password and enable account .
earlier i was using 1 single object , but after looking at a few posts i decided to use 'using' for 3 different operations
string strDisplayName = txtFirstName.Text + " " + txtLastName.Text;
string strUser = txtLoginName.Text;
string pw = "pass#123";
using (var objADAM = new DirectoryEntry("LDAP://" + adlink + "/CN=Users,DC=SS,DC=COM", "ss\\luser", "pass#123", AuthenticationTypes.Secure))
{
const long ADS_OPTION_PASSWORD_PORTNUMBER = 6;
const long ADS_OPTION_PASSWORD_METHOD = 7;
const int ADS_PASSWORD_ENCODE_CLEAR = 1;
string strPort = "389";
int intPort = Int32.Parse(strPort);
using (var objUser = objADAM.Children.Add("CN=" + strUser, "user"))
{
objUser.Properties["sAMAccountName"].Add(strUser);
objUser.CommitChanges();
}
}
using (var user = new DirectoryEntry("LDAP://" + adlink + "/CN=" + strUser + ",CN=Users,DC=SS,DC=COM", "ss\\rluser", "pass#123"))
{
user.Invoke("SetPassword", new object[] { "password" });
user.CommitChanges();
}
using (var user = new DirectoryEntry("LDAP://" + adlink + "/CN=" + strUser + ",CN=Users,DC=SS,DC=COM", "ss\\rluser", "pass#123"))
{
//Enable account and change password on first logon flag
user.Properties["userAccountControl"].Value = 0x200;
user.Properties["pwdLastSet"].Value = 0;
user.CommitChanges();
}
I must mention, that i am outside the domian, and trying to connect to a remote AD on another domain . The credential's passed however are the ADMIN
The user creation goes on smoothly (after some hiccups with port opening & LDAP connections) , but the issue occurs when the invoke ->setpassword is called .
The error is :"the RPC server is unavailable " , just to make sure i am not doing something wrong in my code, i downloaded a LDAP admin tool and tried to reset the password of an existing user ->same error
steps
-checked the RPC service running
-opened RPC ports -135 ,blah blah..basically every port there is to open :|
any help is appreciated .
Thanks
Rajat

Answer 1

For example:
DirectoryEntry de = new DirectoryEntry();
de.Path = "LDAP://dnsname.domain.com:389/OU=Companies;
Microsoft recommends accessing using DNS.
if the machine you are accessing is connected to a different domain, you must specify it as "ip dnsname" in the hosts file in the "C:\Windows\System32\drivers\etc " directory.

Answer 2

using adlink is string domain, because AD method Invoke using domain name: "abc.com"