Please sanitize any data you post here so it does not contain any of your internal server names or IP's.
Here is the error:
2019-10-17 13:03:48 I #5984 creposi Trying the repository ePO_servername
2019-10-17 13:03:48 I #5984 downloader Network is down
2019-10-17 13:03:48 I #5984 downloader Network is down, update from remote site can't be done.
2019-10-17 13:03:48 I #5984 creposi Repository ePO_servername is not usable for the current update session.
What version of the agent are you running? Check also KB84080 - is the system event notification service running?
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Thank you for your update. Upgrading to ENS and using a newer version of McAfee ePO is absolutely a great idea. However, I am concerned that you are removing ePO for the same.
Is this a test environment where you are doing this? if yes, then, it should be alright! however if this is a production environment, We will be glad to assist you in resolving it without having to go through removal of ePO. If you prefer live troubleshooting, please do not hesitate to contact us directly by creating a ticket with us.
Also, from the logs, I can see that you are deploying VSE 8.8 Patch 10 on the machine. You can try deploying VSE 8.8 Patch 13 (the latest) or ENS from the same ePO and you can also upgrade the ePO. However, to resolve the issue feel free to contact us via a support ticket.
Having said that, if you can give @cdinet's suggestion a try, we would be very happy to see if that resolves the issue as the error message you receive has an uncanny resemblance to what is reported in the KBA. Here is a clickable link to the KBA referred for your kind reference:
As always, we are here available to assist you with any further queries or assistance you need regarding this issue. Sincerely hope the issue gets resolved for you. Kudos to you for your efforts and co-operation here.
Not sure if Agent is actively communicating to EPO. Though if it is showing as Managed, doesn't mean that deployment will work you have to check the communication as well. If it does not show last communication, then first you have check why it is not communicating. If it is communicating, then as @cdinet mentioned, please check out the below link to troubleshoot deployment related issues.
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