Dell NetWorker 19.9 Administration Guide

• RPC errors
• Unknown host errors
• Failures in contacting the portmapper
• Connection failures or time outs
• Unexpected exits by programs
• Connection refused errors
• Failure of a remote command (rcmd() function) to an active client
• Failures in name-to-address translation
• Program not registered errors
• Failures of NetWorker services to start
• Failures of NetWorker services to remain active
• Invalid path errors

When NetWorker operations fail due to name resolution issues, the following error messages can appear in the daemon.raw file or in the policy report:

• Host name for IP address IP_address could not be determined through DNS
• IP address for host 'hostname' could not be determined through DNS
• Warning, cannot resolve host hostname to IP_address, name server may be misconfigured.
• 'Client_name': Couldn't look up the name of address:'NetWorker_server_IP':node name or service name not known.
• nsrexec: nsrexecd on (client) is unavailable. Using rsh instead
• nsrexec: host hostname cannot request command execution permission denied
• Cannot connect to nsrexecd on client NetWorker_server .rhost permissions do not allow rsh permission denied

Before you can troubleshoot name resolution and connectivity issues, you must determine between which hosts the connection problems occurred. The problems can occur between any two types of NetWorker hosts, for example, between the NetWorker server and a client or between a client and a storage node.

Complete the following steps to troubleshoot name resolution and connectivity errors:

1. Document the steps you take and the results, especially error messages, in case you need to contact Customer Service.
2. Use operating system tools to confirm that basic connectivity exists between the source and destination hosts. For example, telnet, ping, and traceroute. Verifying basic connectivity provides more information.
3. Check that the source and destination hosts consistently and correctly resolves all names and IP addresses for each host. Verifying name resolution provides more information.
4. Verify that the configuration of the source and destination host includes all relevant information for each host in the Aliases attribute and the servers file. Verifying the NetWorker configuration provides more information.