![]() PortQry Command Line Port Scanner Version 2.0 PortQry.exe is a free download from Microsoft. To resolve that common concern, review the ports required for Active Directory in Service overview and network port requirements for Windows and then to use the Port Query tool (PortQry.exe) to examine the ports that are in user or available for use on local computer and domain controller. ![]() A common cause is network ports being inadvertently restricted. Many methods may be used to verify that connectivity is sufficient since there are many causes of network problems. Verify that the network connectivity between the local computer and the domain controller(s) has the required ports open on both client (local computer) and server (domain controller). To resolve this issue if the cause is only network difficulties: The secure channel for the computer is either interrupted by network difficulties or the computer's local copy of its password no longer matches the copy of it on the Active Directory domain controller, or both conditions exist. This condition is known as a "broken secure channel". They may also be tied to a specific network location or locations. These symptoms may be intermittent or consistent. Netlogon source events in the System event log of IDs 5719, 5722 or 5723. When attempting to access a resource, such as a file or folder, across the network you receive a message "access denied" or "no logon servers available to service the logon request." ![]() When attempting to log onto a computer, you receive the message "no logon servers available to service the logon request." The attempted logon will not be successful. ![]() You've ran the CSS Authentication Diagnostic and it has notified you of secure channel problems. This article provides a solution to detected secure channel problems.Īpplies to: Windows Server 2012 R2, Windows Server 2008 R2 Service Pack 1 Original KB number: 2753702 Symptoms ![]()
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