Customer reported sometimes when review the image in Apollo essential admin console, the preview windows will show "The requested file is larger than is permitted by the license on this APOLLO Essentials" error. The same issue can be found when doing WMS request:
The requested file is larger than is permitted by the license on this APOLLO Essentials
The reason is that Apollo essential service is not fully initialized correctly. Intergraph licensing 2018 service is started as "delayed start", so there is a chance that Apollo essential is started before licensing service. Because of licensing is not started so Apollo essential services is not fully initialized.
The workaround is the recycle Apollo essential app pool or restart IIS after Intergraph licensing service is fully started.