<div><blockquote class="gmail_quote" style="margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding-left:1ex">Yeah.  Assuming you're using the default check-host-alive command, which pings hosts, that obviously won't work if you can't ever ping the host.
<br><br>You'll need to define a new check command that *can* determine if the host is up or down.<br></blockquote></div><br><div>Perfect.  Since they're Exchange servers, I changed a variable in my "define host" section.
</div><div><br class="webkit-block-placeholder"></div><div>#was</div><div><div>#       check_command                   check-host-alive ; Default command to check Linux hosts</div><div><br class="webkit-block-placeholder">
</div><div>#is now</div><div>        check_command                   check_smtp</div><div><br> </div><div>Thank you very much for your help, Patrick!</div></div>