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Event ID: 5719 Source: NETLOGON

Source
Level
Description
No Domain Controller is available for domain <mydomain> due to the following:
<error message>. 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.
Comments
 
Error message: "There are currently no logon servers available to service the logon request." - In our case, this was caused by the Gigabit Ethernet NIC and switch port being set to Autodectect speed/duplex and not being able to detect Gig speed. Setting the switch port to 'portfast' did not resolve the problem, nor did setting the NIC or switch port to a fixed Gig speed/full duplex.

For Windows 7 computers, the hotfix supplied by MS at ME2459530 resolved the issue.

For XP machine, creating registry entry in either the local machine's registry or in Group Policy -> Computer Configuration -> Preferences -> Windows Settings -> Registry of:
HKLM\System\CurrentControlSet\Services\Tcpip\Parameters\DisableDHCPMediaSense as a REG_DWORD, Decimal Value 1

I set as REPLACE, as Update doesn't always seem to be read when GP is applied by machines.
See also the comments for the Windows 2000 version of event id 5719 (link below).

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