I am a Linux newbie, and I have CentOS 5 running on VMWare and I have CentOS 4 running on a PC. I have the NRPE plugin configured on the PC. Nagios is monitoring as expected on both the PC and virtual machine and displaying the info in the Web Interface on both. I set up the remote NRPE plugin, but I am unable to view the remote PC in the virtual Web Interface. I followed all the Nagios technical documentation and all checks are as expected. I can PING both machines from each other and I have tried switching off all Firewalls (PC, Virtual and XP). I can receive email alerts from both Virtual and PC. I must be missing something here but I (think) I have tried everything. Nagios is 3.0.6 and nrpe plugin is 1.4.10. Any info appreciated!!!