Further to add on this, is there any backout plan after AH upgrade if something goes wrong.
Actually, you should always keep your Agent Handlers at the same rev level as the ePO server itself.
Utilizing virtual machine snapshots is a great way of providing a simple back out plan.
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Did you stop Event Parser and Apache service on your AG prior to epo Server upgrade to 5.3?
After the epo upgrade
Open folder where extract was done
Copy AGENT HANDLER folder to your agent handler systems
run set up
(Destination folder cannot contain double-byte character's)
Type in name of ePO Server AG to communicate with
specify port for client to server use
You need ePO Admin USER and PW with Global rights
for DAtabase Information DB instance and server (DB-Server\ServerName
list authentication type (Smart card ect)
Your user anem and password
DB name again if not already populated
Run final install
when Complete re enable from the AG interface in the ePO console and reenable your AG services in the AG system(s)
PS make sure your AG polices separate the traffic to AG's if the Where of reporting to is important for your systems, i.e. distant or physically closer
IF a first time AG install the steps are not the same as above.
If your AG is a VM then a snapshot is a simple back out.
Be sure to delete the snapshot when post testing passes. That will get too big and slow down your realtime instance.
Yes, I stopped the AH services before the ePO upgrade. And I started them after the upgrade completed.