<tt>nagios-users-bounces@lists.sourceforge.net wrote on 25/10/2006 23:30:19: </tt> <tt>[snip]</tt> <tt> > Here is the /var/log/messages on host18...</tt> <tt>> </tt> <tt>> Oct 25 15:10:10 host18 sshd2[870]: connection from "10.1.1.1" > Oct 25 15:10:10 host18 sshd2[13080]: DNS lookup failed for "10.1.1.1". > Oct 25 15:10:10 host18 sshd2[13080]: Remote host disconnected: Key > exchange failed. > Oct 25 15:10:10 host18 sshd2[13080]: Key exchange failed in remote: > 'Key exchange failed.'</tt> <tt>The log file is telling exactly what the problem is.. The ssh key exchange failed..</tt> <tt>Fix the key exchange.. There's a problem with the private/public keys.. Maybe they don't exist on the remote server, or aren't set up right, or don't have the right permissions. With the commercial SSH package I'm using, it uses keys in the ~/.ssh2 folder.. It's not the same as OpenSSH, and the keys are in a different format.</tt> <tt>You should look up the documentation for SSH2 for your operating system and set up keynegotiation for the user that is connecting to host host18. You need key exchange to work before you can use the check_by_ssh plugin. There is good documentation for Commercial SSH, that's why you pay for it.</tt> <tt>rob</tt> <pre> This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. ********************************************************************************************** BNP Paribas Private Bank London Branch is authorised by CECEI & AMF and is regulated by the Financial Services Authority for the conduct of its investment business in the United Kingdom. BNP Paribas Securities Services London Branch is authorised by CECEI & AMF and is regulated by the Financial Services Authority for the conduct of its investment business in the United Kingdom. BNP Paribas Fund Services UK Limited is authorised and regulated by the Financial Services Authority </pre>