Dell Chassis Management Controller Version 3.10 for Dell EMC PowerEdge VRTX User's Guide

Why are the remote RACADM and Web-based services unavailable after a property change?

It may take a minute for the remote RACADM services and the web interface to become available after the CMC Web server resets.

The CMC web server is reset after the following occurrences:

• Changing the network configuration or network security properties using the CMC web user interface.
• The cfgRacTuneHttpsPort property is changed (including when a config -f <config file> changes it).
• racresetcfg is used or a chassis configuration backup is restored.
• CMC is reset.
• A new SSL server certificate is uploaded.

My DNS server doesn’t register my CMC?

Some DNS servers only register names with a maximum of 31 characters.

When accessing the CMC Web interface, a security warning stating that the SSL certificate was issued by a certificate authority that is not trusted is displayed.

CMC includes a default CMC server certificate to ensure network security for the web interface and remote RACADM features. This certificate is not issued by a trusted certificate authority. To address this security concern, upload a CMC server certificate issued by a trusted certificate authority (such as Thawte or Verisign).

Why is the following message displayed for unknown reasons?

Remote Access: SNMP Authentication Failure

As part of discovery, IT Assistant attempts to verify the device’s get and set community names. In IT Assistant, the get community name = public and the set community name = private. By default, the community name for the CMC agent is public. When IT Assistant sends out a set request, the CMC agent generates the SNMP authentication error because it only accepts requests from community = public.

Change the CMC community name using RACADM. To see the CMC community name, use the following command:

racadm getconfig -g cfgOobSnmp

To set the CMC community name, use the following command:

racadm config -g cfgOobSnmp -o cfgOobSnmpAgentCommunity <community name>

To prevent SNMP authentication traps from being generated, enter input community names that are accepted by the agent. Since CMC only allows one community name, enter the same get and set community name for IT Assistant discovery setup.

When accessing the CMC Web interface, a security warning stating that the host name of the SSL certificate does not match the host name of CMC is displayed.

CMC includes a default CMC server certificate to ensure network security for the web interface and remote RACADM features. When this certificate is used, the web browser displays a security warning if the default certificate does not match the host name of CMC (for example, the IP address).

To address this security concern, upload a CMC server certificate issued to the IP address of CMC. When generating the certificate signing request (CSR) to be used for issuing the certificate, ensure that the common name (CN) of the CSR matches the IP address of CMC (for example, 192.168.0.120) or the registered DNS CMC name.

To ensure that the CSR matches the registered DNS CMC name: