Data Domain: Alert EVT-NETM-00009: Unable to Communicate with Configured DNS

Summary: This article describes the purpose of the Domain Name System (DNS) alert "Unable to communicate with configured DNS" on Data Domain operating system 5.5 and later.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

The following is an alert created by the Data Domain Operating System (DDOS): 
Current Alerts
--------------
Id   Post Time                  Severity   Class     Object   Message
--   ------------------------   --------   -------   ------   ----------------------------------------------------------
30   Tue Nov 25 15:46:53 2014   CRITICAL   Network            EVT-NETM-00009: Unable to communicate with configured DNS.
--   ------------------------   --------   -------   ------   ----------------------------------------------------------

Cause

In DDOS 5.5, a new feature was introduced to check on the functionality of the configured DNS. This feature attempts to resolve the domain "emc.com." If the name is not resolvable, the alert is posted.
 
Note: Starting with DDOS 7.10, the Data Domain looks for "dell.com" automatically.

Also note:  The name the name is admin user configurable in DD OS 7.10+.

Resolution

Ensure that the DNS configuration can resolve the domain emc.com.

  • To test the resolution, from the Command-Line Interface (CLI) interface, run:
# net lookup emc.com
Note: Starting with DD OS 7.10, the Data Domain looks for "dell.com" automatically.
 
  • To check for the configured DNS address on the CLI, run:
# net show dns
  • To correct the DNS entry, run:
# net set dns  

Example: net set dns 10.10.10.10,10.10.10.11
  • To check if the name is resolvable:
# net lookup <Name or IP that you are looking up>
  • Starting in DD OS 7.10+:  To change the name that the Data Domain looks for:  (Ensure that this name is resolvable by your configured DNS server) 
# reg set config.net.dns_domain_name=<Your resolvable name here>

Example: reg set config.net.dns_domain_name = anycomp.com
  • If you are on older code than DDOS 7.10, support can make the change for you.
  • If you want DNS monitoring to be disabled outright, support can also set a registry key to disable it. This does require an FS restart with about 30mins of downtime.

Affected Products

Data Domain, Data Domain

Products

Data Domain, Data Domain, Data Domain Boost – File System, Data Domain Boost - Open Storage, Data Domain Deduplication Storage Systems, DD Boost for Enterprise Applications, DD OS, DD OS Licensed Features
Article Properties
Article Number: 000071415
Article Type: Solution
Last Modified: 20 Aug 2025
Version:  8
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