Why would you by a "web printer" if at the same time you want to block its access to or from the internet?
Let's just see what we are talking about here:
- the is a printer whose purpose is to allow direct printing from the web
- the direct printing from the web is done through the HP ePrintCenter which is a service hosted by HP and which accepts the print jobs.
- your printer merly connects to HP ePrintCenter to pull jobs from there are do any other tasks it is being told to do
So if you in any way block the access from your printer to HP ePrintCenter, then you effectivly block your pritner's ability to print (or at least to use the web printing, I don't know if these printers can also do local printing), and in that case, why did you buy this printer in first place?