Hi Alysson, I am not sure I fully understand your issue, however in my experience with NT 4 trusts in the past, you may have to reboot the PDC controller. If it still does not solve your issue. Try deleting the trust, and recreating them. Hope this helps solve your issue. Boa Dia, Jose Medeiros ADP | National Account Services ProBusiness Division | Information Services 925.737.7967 | 408-449-6621 CELL ---------------------------------------------------------------------------- -----Original Message----- From: Alysson Dias [mailto:alysson@xxxxxx] Sent: Thursday, October 27, 2005 7:54 AM To: [ExchangeList] Subject: [exchangelist] Trust NT and Win2003 http://www.MSExchange.org/ My Friends... I have a here interesting situation to decide... I have two domains in the network... being that one of them is a PDC in NT4 and Exchange5.5. The other is a domain Win2003 and some sub-domain (child).... I obtained to create one trust relation between the two domains, and of this form I can change the Primary Account of e-mails the Exchange5.5, of form that the users of the domain Win2003 can use its password of the net to login in e-mail of the domain NT... This trust in the domain Win2003 was as "external"... Then I tried you create one trust between the NT and the sub-domain of the Win2003...The NT accepted, but it only accepted to create as "Realm" in the sub-domain (This is currect?)... In the hour to change the Primary Account of the account of email of the NT for the sub-domain of the Win2003, it he arrives to see the users of the sub-domain and I obtain adds it as Primary Account, but he gives an error: "No mapping between account names and security IDs was done" Microsoft Windows NT ID no: 0xc0020534 Then I obtain to make this between the domain NT and Win2003, but not I obtain between the dominio NT and the subdominio of the Win2003. it has some form to decide this? Tks Alysson Dias Rio de Janeiro - Brazil ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: jmedeiros@xxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx