Users Guide

Answer: You must discover the ESXi host server using SNMP and WSMan or the guest virtual machine will not correlate correctly
when discovered using SNMP.
Question: Why are devices discovered with WMI getting classified as Unknown?
Answer: WMI discovery classifies a device as unknown when the credential for a user account in the Administrators group (not
Administrator) is supplied for the discovery range in some cases.
If you are seeing this issue, read the KB article at support.microsoft.com/?scid=kb;en-us;951016 and apply the registry work as
described. This resolution applies to managed nodes with Windows Server 2008 R2.
Question: Why are Dell devices discovered using WS-Man with root CA certificate getting classified as Unknown?
Answer: There may be a problem with the root certificate you are using to discover the WS-Man target(s). For instructions to
discover and inventory WS-Man target(s) using a root CA certificate, see Discovering and Inventorying Dell Devices Using WS-Man
Protocol With a Root Certificate.
Question: What are SNMP authentication traps?
Answer: An authentication trap is sent when an SNMP agent is hit with an enquiry that contains a community name it does not
recognize. The community names are case-sensitive.
The traps are useful to find if someone is probing a system, although its better nowadays to just sniff packets and find out the
community name.
If you use multiple community names on the network, and some management might overlap, users may want to turn these off as
they become false positives (annoyances).
For more information, see technet.microsoft.com/en-us/library/cc959663.aspx.
When an SNMP agent receives a request that does not contain a valid community name or the host that is sending the message is
not on the list of acceptable hosts, the agent can send an authentication trap message to one or more trap destinations
(management systems). The trap message indicates that the SNMP request failed authentication. This is a default setting.
Question: Why does OpenManage Essentials not support entering host names with underscore in the discovery wizard?
Answer: Per RFC 952, underscores are not valid in DNS names. A name (net, host, gateway, or domain name) is a text string up to
24 characters drawn from the alphabet (A-Z), digits (0-9), minus sign (-), and period (.). Periods are only allowed when they serve
to delimit components of domain style names.
For more information see,ietf.org/rfc/rfc952.txt and zytrax.com/books/dns/apa/names.html .
Question: What is On-demand?
Answer: On-demand is an operation where a managed system is checked for status/health by OpenManage Essentials when an
SNMP trap is received. There are no settings to be changed to enable the on-demand feature. However, the IP address of the
management system must be available in the trap destination of SNMP service. An SNMP trap is received from the managed
system when there is an issue or failure of a server component. These traps can be viewed under the alert logs.
Question: I have discovered the server with the SNMP protocol, but the RAC name of the iDRAC is not displayed in the device tree,
portals, and wizards.
Answer: RAC name is displayed only if you have discovered the iDRAC with the WS-Man protocol. Otherwise, the system name is
displayed instead of the RAC name.
Question: Why do devices that are already discovered disappear from the device tree during discovery?
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