Edit the /usr/local/nagiosxi/html/includes/constants.inc.php file and change the SB_LOGLEVEL to 0 like the following example.
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define('SB_LOGLEVEL', 0);
Run this on the nagios server and post the output so I can get the list and versions of the packages on the server. Post it here.
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yum list installed |grep php
yum list installed |grep ssh
Can you delete the public key on the nagios server and the entry in the authorized_keys on the Gentoo server to rule that out as the issue?