The last view days I have been struggling to publish a image after there was maintenance done on the image. After a view retries I could happen that the image would come online again.
Every time with the same message “DaaS Agent is failed to send application list to Desktop Manager. “

In the desktone log you will find the same error message as well (Only your service provider can look into these logs). That is where you will look the first right 😉
After a while I took a look in the slony log and saw some ERROR and FATAL messages, I can tell that that is something you don’t want!
To fix this kind of errors you need to follow the following steps: https://docs.vmware.com/en/VMware-Horizon-DaaS/services/horizondaas.spmanual800/GUID-D85773AC-0B73-43AB-B52F-48958E9D9E85.html
Here the tell you how to reinitialize the slony.