DPA: Data Domain data collections failed with 'Failed to open SNMP session for host'
Summary: Data Protection Advisor (DPA): Data Domain data collections failed with 'Failed to open SNMP session for host'.
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Symptoms
When attempting to discover a Data Domain (DD), with DPA the following error message is returned:
failed to open SNMP session for host
When running the collection request, in debug from the UI the following information is returned in the dpaagent.log:
DBG1 12723.12723 20190724:144105 com.snmp - aapiSNMPOpen(): Overriding SNMP timeout to 10 seconds
DBG1 12723.12723 20190724:144105 com.snmp - aapiSNMPOpen(): Failed to open SNMP session for host 'dd01.emc.lab', errno 0, snmp_error 'Unknown host (host_name)'
DBG1 12723.12723 20190724:144105 agent.mod.dd - perf_snmp(): aapiSNMPOpen() failed Cause
The DPA agent is unable to resolve the DD hostname thus unable to connect to the SNMP service on the DD.
Resolution
To confirm name resolution is the issue, the nslookup command can be run on the agent server using the DD FQDN. If the IP address is not returned, then this confirms that the problem is name resolution.
There are two ways to resolve name resolution issues.
1. Have the A record created in the DNS server so the FQDN resolves successfully.
2. Add the DD to the hosts file on the agent server, and ensure the O/S has been enabled to check the host file and DNS.
Contact Dell Support for further details or information.
Article Properties
Article Number: 000168511
Article Type: Solution
Last Modified: 23 Jun 2025
Version: 5
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