You are no longer receiving any email alerts from your LEM and/or all rules have stopped firing.
All LEM versions
The LEM appliance's time, date, or time zone are not accurate. There may be an email address issue. There may also be an issue with the email connector combined with a performance or timing issue.
Type appliance, press Enter, type dateconfig, and press Enter four times.
Configure an NTP Server (Recommended)
You may want to configure your LEM to use one or more NTP servers to keep accurate time going forward. You will first need to configure your virtual appliance to not sync its time with the VM host.
In VMware vCenter, highlight your appliance and go to Edit Settings > Options > VMware Tools and uncheck the Synchronize guest time with host checkbox.
In Hyper-V, highlight your appliance and go to Settings... > Integration Services and uncheck Time synchronization.
Still in the appliance menu, type ntpconfig and press Enter twice.
Enter the hostname or IP address of your NTP server. You can also specify an internet server, such as 0.north-america.pool.ntp.org
Type y to confirm your server and press Enter. Type y if you want to specify another server or n if you don't and press Enter.
It will state Running ntpdate to synchronize clock and return you to the prompt. You should now be time synced with NTP.
If LEM is under excessive load because hardware reservations are not configured or insufficient for your event load, rules may stop firing entirely. Refer to the Planning your deployment section of SolarWinds LEM Quick Start and Deployment Guide to determine if you have adequate reservations for your environment.