DNS cluster connection error - "IO::Socket::SSL 1.42 must be installed for https support"

Symptoms

In WHM, the DNS Cluster status shows as:

CONFIG_TEXT: Could not communicate with remote API server.

Also, the following is logged to the cPanel error log (/usr/local/cpanel/logs/error_log):

CONFIG_TEXT: warn [queueprocd] Could not connect to https://$IP:2087/json-api/version: IO::Socket::SSL 1.42 must be installed for https support

Cause

This error is caused by a recent update of the perl-Net-SSLeay package.

Resolution

You must restart the queueprocd service to apply the package update to it:

# /scripts/restartsrv_queueprocd