<p>This bug is related to a change in the response behavior of BIND 9.9.5. See <a href="https://deepthought.isc.org/article/AA-01113/0/Case-Insensitive-Response-Compression-May-Cause-Problems-With-Mixed-Case-Data-and-Non-Conforming-Clients.html">https://deepthought.isc.org/article/AA-01113/0/Case-Insensitive-Response-Compression-May-Cause-Problems-With-Mixed-Case-Data-and-Non-Conforming-Clients.html</a></p>

<p>The problem is not in BIND 9.9.5 but that check_dig is case-sensitive in what it accepts!</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br><a href='https://github.com/monitoring-plugins/monitoring-plugins/issues/1233#issuecomment-34491074'>Reply to this email on GitHub</a>.<img src='https://github.com/notifications/beacon/5514713__eyJzY29wZSI6Ik5ld3NpZXM6QmVhY29uIiwiZXhwaXJlcyI6MTcwNzMzNDE1MCwiZGF0YSI6eyJpZCI6MjUxNzI2MjR9fQ==--2831c126787fd76633cadea1dd81c551253d20b4.gif' height='1' width='1'></p>