<div class="gmail_quote"><div>Hi Chris, Some tinkering led me to the same thing - and it got resolved after I 1. Installed the openssl-devel package, and 2. Ran ./configure with the --with-openssl=<open ssl lib dir> option and built it again. Thanks! Regards Hrish </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Date: Mon, 27 Dec 2010 09:55:13 -0500 From: Chris Beattie <<a href="mailto:cbeattie@geninfo.com">cbeattie@geninfo.com</a>> Subject: Re: [Nagios-users] check_smtp doesn't support TLS? To: Nagios Users List <<a href="mailto:nagios-users@lists.sourceforge.net">nagios-users@lists.sourceforge.net</a>> Message-ID: <<a href="mailto:4D18A8D1.9090808@geninfo.com">4D18A8D1.9090808@geninfo.com</a>> Content-Type: text/plain; charset="iso-8859-1"; format="flowed" <a href="mailto:talonx@gmail.com">talonx@gmail.com</a> wrote: > I'm trying to setup the check_smtp plugin for a remote mail server. I > downloaded the latest version of nagios-plugins, built and installed > it. This is what I get when I invoke check_smtp from the command line > (actual data removed) - > > received 530 5.7.0 Must issue a STARTTLS command first > > I'm including the -S flag for it to use TLS. I couldn't see any other > options that might be relevant. Any pointers? I had something similar happen to me with SSL once. I compiled and installed the plugins, but I could not get SSL to work for the check_http command. I had installed the openssl package, but I had forgotten to install the openssl-devel package before I compiled the plugins. When you ./configure the plugins, does it say "--with-gnutls: no" at the end? You may have to install the gnutls-devel package first. </blockquote></div>