Thank you MartinK, sorry but I am not finding the troubleshooting documentation very easy to understand.
I agree that it appears to be certificate related, the log file covers activity for the entire day and lists machines that have the software installed.
It is not clear to me from the errors what particular task is failing to run, if it's trying to communicate with the locally installed client for a status update, or trying to upgrade the version or modules etc.
My colleagues have previously had success in pushing out Client Tasks they have created, I have tried to repeat the same Client task. So far it has only installed successfully once but it did not activate the product.
When I create new Client or Server tasks I am unable to enter the passphrase for the certificate, as this has not been recorded.
So I have been working with Client and Server Tasks that were previously created and appear to have the passphrase saved already. It may be that at somepoint configuration was changed but I do not know how to troubleshoot for that.
Maybe a health check of the server is required or a walkthrough guide on what are the basic settings that need to be in place on a fresh installation. I have searched but have so far not found such information.
I have raised this as a support case because I cannot deploy the ESET Remote Agent or AV software directly to a domain joined computer.