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    <p>looking though reflector at System.DirectoryServices.AccountManagement the internal class "UnsafeNativeMethods" is implemented in native code, so UserSuppliedServerName one level up is all I can go on without looking at the CLR VM, (frankly im not sure even how to do that) Seems that a node is failing to return its primary group, so perhaps consider other implementations, after a bit of googling ive come across these that may help</p> <ul> <li><p><a href="http://www.funkycoding.com/?p=345" rel="noreferrer">Active Directory and nested groups</a> <em>this one may be promising</em> heres the code sample..</p> <pre><code> public IList&lt;string&gt; FindUserGroupsLdap(string username) { // setup credentials and connection var credentials = new NetworkCredential("username", "password", "domain"); var ldapidentifier = new LdapDirectoryIdentifier("server", 389, true, false); var ldapConn = new LdapConnection(ldapidentifier, credentials); // retrieving the rootDomainNamingContext, this will make sure we query the absolute root var getRootRequest = new SearchRequest(string.Empty, "objectClass=*", SearchScope.Base, "rootDomainNamingContext"); var rootResponse = (SearchResponse)ldapConn.SendRequest(getRootRequest); var rootContext = rootResponse.Entries[0].Attributes["rootDomainNamingContext"][0].ToString(); // retrieve the user string ldapFilter = string.Format("(&amp;(objectCategory=person)(sAMAccountName={0}))", username); var getUserRequest = new SearchRequest(rootContext, ldapFilter, SearchScope.Subtree, null); var userResponse = (SearchResponse)ldapConn.SendRequest(getUserRequest); // send a new request to retrieve the tokenGroups attribute, we can not do this with our previous request since // tokenGroups needs SearchScope.Base (dont know why...) var tokenRequest = new SearchRequest(userResponse.Entries[0].DistinguishedName, "(&amp;(objectCategory=person))", SearchScope.Base, "tokenGroups"); var tokenResponse = (SearchResponse)ldapConn.SendRequest(tokenRequest); var tokengroups = tokenResponse.Entries[0].Attributes["tokenGroups"].GetValues(typeof(byte[])); // build query string this query will then look like (|(objectSid=sid)(objectSid=sid2)(objectSid=sid3)) // we need to convert the given bytes to a hexadecimal representation because thats the way they // sit in ActiveDirectory var sb = new StringBuilder(); sb.Append("(|"); for (int i = 0; i &lt; tokengroups.Length; i++) { var arr = (byte[])tokengroups[i]; sb.AppendFormat("(objectSid={0})", BuildHexString(arr)); } sb.Append(")"); // send the request with our build query. This will retrieve all groups with the given objectSid var groupsRequest = new SearchRequest(rootContext, sb.ToString(), SearchScope.Subtree, "sAMAccountName"); var groupsResponse = (SearchResponse)ldapConn.SendRequest(groupsRequest); // loop trough and get the sAMAccountName (normal, readable name) var userMemberOfGroups = new List&lt;string&gt;(); foreach (SearchResultEntry entry in groupsResponse.Entries) userMemberOfGroups.Add(entry.Attributes["sAMAccountName"][0].ToString()); return userMemberOfGroups; } private string BuildHexString(byte[] bytes) { var sb = new StringBuilder(); for (int i = 0; i &lt; bytes.Length; i++) sb.AppendFormat("\\{0}", bytes[i].ToString("X2")); return sb.ToString(); } </code></pre></li> </ul> <p>These are more for info purposes</p> <ul> <li><a href="http://support.microsoft.com/kb/297951" rel="noreferrer">How to use the PrimaryGroupID attribute to find the primary group for a user</a></li> <li><a href="http://en.csharp-online.net/User_Management_with_Active_Directory%E2%80%94Determining_User_Group_Membership_in_Active_Directory_and_ADAM" rel="noreferrer">Determining User Group Membership in Active Directory and ADAM</a></li> </ul>
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    1. POQuerying Active Directory from MVC result in: Attempted to access an unloaded appdomain. (Exception from HRESULT: 0x80131014)
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    1. USalmog.ori
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    1. POQuerying Active Directory from MVC result in: Attempted to access an unloaded appdomain. (Exception from HRESULT: 0x80131014)
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    1. COI will try this method out today, and hopefully post my findings in a few hours. Thanks a lot though.
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    2. COThis is working well so far, just a few more tests to run
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