DC promo failed with below error ..need urgent help

Hi

DCpromo on a member server failed with below error. The server is behind firewall however we have opened all necessary ports.

Need urgent help on this ...

cpromoui B7C.684 0DB6 16:46:06.213     Enter DoProgressLoop
dcpromoui B7C.684 0DB7 16:46:06.213       Enter State::GetOperation REPLICA
dcpromoui B7C.684 0DB8 16:46:06.213       Enter ProgressDialog::UpdateButton
dcpromoui B7C.684 0DB9 16:46:06.213         Enter ProgressDialog::UpdateButton Cancel
dcpromoui B7C.684 0DBA 16:46:07.626       Enter ProgressDialog::UpdateText Located domain controller ATMSPADS06.tms.toyota.com for domain tms.toyota.com

dcpromoui B7C.684 0DBB 16:46:28.628       Enter ProgressDialog::UpdateText The attempted domain controller operation has completed

dcpromoui B7C.684 0DBC 16:46:28.628       Enter ProgressDialog::UpdateButton 
dcpromoui B7C.684 0DBD 16:46:28.628       Progress loop complete.
dcpromoui B7C.684 0DBE 16:46:28.628       Calling DsRoleGetDcOperationResults
dcpromoui B7C.684 0DBF 16:46:28.628       Error 0x0 (!0 => error)
dcpromoui B7C.684 0DC0 16:46:28.628       Operation results:
dcpromoui B7C.684 0DC1 16:46:28.628       OperationStatus      : 0x3A !0 => error
dcpromoui B7C.684 0DC2 16:46:28.628       DisplayString        : Dcpromo failed because the helper DC <servername> couldn't be contacted