Hello I'm currently running Nagios 3.2.1, and have been having issues with avail.cgi. If a report is run for a service which has a period of scheduled downtime outside of rpttimeperiod, then there are negative percentages for unscheduled critical. To recreate this: - The report must be run with a time period such as 'workhours'. The issue does not occur with 24x7. - The service must have a scheduled downtime period which lies outside of the report time period. After a bit of digging this turned out to be due to the total critical time being calculated based on the rpttimeperiod, but the calculation of the scheduled critical time ignoring this and always being 24x7, i.e. total(during rpttimeperiod) - scheduled(at any time) = unscheduled I've had a go at fixing this in version 3.2.1, and the diff is attached. There are undoubtably many things wrong with the way I have done this, but thought I'd send it anyway! It also contains a fix for the stray 'TEST' when outputting to csv, which I notice has already been fixed in version 3.2.3. I've checked, and this is also a problem with avail.cgi version 3.2.3. Thanks Jon