Hi David,<div id="yMail_cursorElementTracker_1619276480009"><br></div><div id="yMail_cursorElementTracker_1619276480274"><br></div><div id="yMail_cursorElementTracker_1619276480936">let's start with the DNS.</div><div id="yMail_cursorElementTracker_1619276491472">Check that both nodes resolve each other (both A/AAAA &amp; PTR records).</div><div id="yMail_cursorElementTracker_1619276521136"><br></div><div id="yMail_cursorElementTracker_1619276521420">If you set entries in /etc/hosts, check them out.</div><div id="yMail_cursorElementTracker_1619276557190"><br></div><div id="yMail_cursorElementTracker_1619276557444">Also , check the output of 'hostname -s' &amp; 'hostname -f' on both hosts.</div><div id="yMail_cursorElementTracker_1619276596497"><br></div><div id="yMail_cursorElementTracker_1619276596749"><br></div><div id="yMail_cursorElementTracker_1619276596984">Best Regards,</div><div id="yMail_cursorElementTracker_1619276611602">Strahil Nikolov</div>