resolv.conf : single-request-reopen leads to resolution failure - Red Hat Customer Portal

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Issue

There are two DNS servers (192.168.1.10 and 192.168.2.10), but one (192.168.2.10) of them is not running.

The client's resolv.conf is

options attempts:2 timeout:1 rotate single-request-reopen
nameserver 192.168.1.10
nameserver 192.168.2.10

Or,

nameserver 192.168.2.10
nameserver 192.168.1.10
options single-request-reopen

dig works and nslookup works, and ping also works. But resolution does not work if ssh or ftp is used.

Environment

Red Hat Enterprise Linux 6

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