Since updating to Virtualmin 4.13 (and subsequently 4.13-2), bandwidth monitoring e-mail notifications are failing. The bandwidth monitoring data is being collected properly, and the graphs are displayed with current information. However, when there is a virtual server/domain which exceeds the limit, the notification sends out a blank e-mail every time the data is being collected. It is ignoring the setting "Interval between sending emails", and it is not using the existing template for sending the e-mail messages. This made it very confusing and time consuming to even track down where the messages were originating.
In miniserv.error, these lines are now logged every time the bw.pl script runs: Error: Write failed : Bad file descriptor
Write failed : Bad file descriptor
Please advise on how this issue can be resolved!