NetWorker: Creating an NSR tunnel failed with error: "create failed: 'proxy address' <IP address> does not resolve to a valid hostname

Summary: Creating an NSR tunnel failed with error: "create failed: 'proxy address' does not resolve to a valid hostname.

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Symptoms

Creating an NSR tunnel failed with error: 
create failed: 'proxy address' < IP address> does not resolve to a valid hostname
The tunnel IP does not exist in the DNS. They are all defined in /etc/hosts.

Cause

The tunneling feature requires reverse lookup in order to work, but on later NetWorker versions (19.7.x and up) reverse lookup was disabled in the code as a security measure.

Resolution

To override the default behavior, create a flag "/nsr/debug/enable_rdns_lookup" on all involved hosts, that is, NetWorker server, tunnel node/proxy and NetWorker client. Restart the NetWorker service for the changes to take effect.
 
NOTE: For tunnel IPs that are only present in /etc/hosts, ensure that the hosts table is read first in /etc/nsswitch.conf.
Article Properties
Article Number: 000222652
Article Type: Solution
Last Modified: 01 Mar 2024
Version:  1
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