Just to add my notes to this thread, I had the same error after updating the OS on a slave and rebooting.
"SLAVE CRITICAL - Error returned from retrieval: Status file does not exist
Communication between the master and slave were fine. I veriifed with:
/usr/local/nagios/bin/send2slaves -t # on the master
/usr/lcoal/nagios/bin/dosh -i -s slavehost uname -a # also on the master
/etc/init.d/opsview-slave test # on the slave
/etc/init.d/opsview-slave status # also on the slave
Slaves were running fine and master could establish communication with reverse ssh tunnel. Checked the slave, the file /usr/local/nagios/var/status.dat was not there. Also, the process import_slaveresultsd was not running. Manually starting this process made no difference. Neither did stopping/starting Opsview on the slave and master mutliple times.
I solved the problem by going to Advanced --> Monitoring Servers. Click on the slave server giving the error and UNCHECK Activated. Then reload configuration. When complete, go back and CHECK Activated and reload configuration.
After the reload, /usr/local/nagios/var/status.dat now exists on the slave and import_slaveresultsd is running on the slave. All slave checks clear from the master.
