Event Type: Error Event Source: NETLOGON Event Category: None Event ID: 5719 Date: 6/28/2011 Time: 9:15:46 AM User: N/A Computer: FSRINT003 Description: This computer was not able to set up a secure session with a domain controller in domain SRIFLEX due to the following: The RPC server is unavailable. This may lead to authentication problems. Make sure that this computer is connected to the network. If the problem persists, please contact your domain administrator. ADDITIONAL INFO If this computer is a domain controller for the specified domain, it sets up the secure session to the primary domain controller emulator in the specified domain. Otherwise, this computer sets up the secure session to any domain controller in the specified domain. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 17 00 02 c0 ...À

Hi, This problem may occur if you have all of the following: Using a DHCP reply to forward DHCP requests (e.g. using VLANs and an IP helper on the router to forward DHCP requests) Windows 7 clients Windows Firewall Public Profile turned on (default configuration - all profiles) DhcpConnForceBroadcastFlag = 0 (Default for Windows 7) The problem occurs when your client has to access the DHCP server via a DHCP relay, such as a router or switch and the DhcpConnForceBroadcastFlag registry key is still set to the default(0). In this situation, the client sends out a broadcasts requesting an IP address, the DHCP relay forwards the request to the DHCP server, the DHCP server sends the reply(ACK reply) to the relay and the DHCP relay sends a unicast reply to the client. If the Public profile is turned on in the Windows Firewall (on by default) then the ACK reply is dropped by the windows 7 clinet firewall . Using Netmon you can see the correct traffic on the wire, but the client is not accepting the ACK packet. Symptoms NETLOGON event ID 5719 in system event log. This computer was not able to set up a secure session with a domain controller in domain <DOMAIN NAME> due to the following: There are currently no logon servers available to service the logon request. Group policies inconsistently applying on start-up. Event ID 50024 logged in the Microsoft-Windows-DHCP Client Events/Operational event log (Ack Receive Timeout has happened in the Interface Id xx) but this log is not enabled by default you have to do it manually. For more information about Netlogon 5719, please see the following articles: Event ID 5719 source Netlogon (dsforum2wiki) http://social.technet.microsoft.com/wiki/contents/articles/event-id-5719-source-netlogon-dsforum2wiki.aspx Netlogon 5719 and the Disappearing Domain [Controller] http://blogs.technet.com/b/instan/archive/2008/09/18/netlogon-5719-and-the-disappearing-domain.aspx The DhcpConnForceBroadcastFlag and Netlogon Error 5719: http://www.facebook.com/topic.php?uid=315647161325&topic=17395 How to force Kerberos to use TCP instead of UDP in Windows http://support.microsoft.com/default.aspx?scid=kb;EN-US;244474 Windows 7 Clients intermittently fail to apply group policy at startup http://support.microsoft.com/kb/2421599 Brent Hu Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

Hello, please post an unedited ipconfig /all from the DC/DNS servers of the domain and machine where the error is logged.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.