[Acidio]

I'm assuming the previous NAT method was automatic. If that was the case, the firewall automatically creates ARP entries for the public address.

If you have disabled the automatic NAT from the object, then these advertisements will no longer be in effect.

To re-enable the HTTP access try adding the automatic static NAT back to the web server object. Don't delete you PAT entries though. (I'm assuming these are above all your other rules.) Since the NAT rules are read from top to bottom, your PAT rules should work fine.

You should see the access to the web server via the public address now work OK.