I forgot to post how I fixed my issue:
On both AIX and Nagios Servers (AIX 5.3 and RHEL 6.3)
reinstalled the nrpe-2.13 agent and to make sure to use --enable-command-args --disable-ssl
Add the vlan in /etc/hosts.allow with nrpe:IP Address - Nagios server
AIX server add Nagios server for allowe_host under /usr/local/nagios/etc/nrpe.cfg
Nrpe issues
Re: Nrpe issues
Hey thanks so much for coming back and posting this, we truly appreciate it. 
Nicholas Scott
Former Nagios employee
Former Nagios employee