@DKanta, to add to this the majority of the time the only thing that you will have to do is retrieve the licenses from the server to get it to function again if it was working previously. I'm not sure why they occasionally drop off but that will usually fix it perfectly fine. If it was working previously there should be no need to change your routing unless you have made other changes to your management port.
i tried to retrieve the license (Device->Licences->Retrieve License keys from License server), but this don't work, after some seconds appear the popup: "Failed to install licenses. Failed to get license info. Please try again later."
It seems that all the Palo Alto servers are unreachable.
yes, because the PA was updated with online method, not downloading the image and uploading on the PA.
So do you suggest me to change the service route configuration?
@DKanta, at that point I would but it would be nice to get TAC involved if this is a wide-spread issue so that they can address and fix it going forward.
Sure give a go (l thought you did already). If your DNS is working there is no way that you will get the same errors by using external interface to talk to the update server.
p.s logging to the support website and check the licence status there by checking your serial number withing assets
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