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1) I think this is a layer 2 problem. Can you see the MAC address?
# arp -an | grep 10.1.75.76
2) If the IP address 10.1.75.76 is a firewall module, a default security policy is installed as long as you have not yet installed a access policy. This means that you cannot ping the fw but you can uninstall the firewall policy and then you can ping the firewall.
# fw unloadlocal
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