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Computer and printer loses connection with firewall

StaffordIT asked
Last Modified: 2012-05-10
We have a small network and it consists of a Cisco ASA 5505 firewall which connects to a HP Procurve switch. We have a computer on the LAN that randomly can't get on the Internet through the ASA. If you log into the firewall, and clear the arp cache, the computer can then get on the Internet again for a while until it happens again. Then I have to clear the arp cache again. I've ran a ping from the computer while it loses connectivity, and I can't ping the firewall, but I can ping other hosts on the network. I've checked the MAC addresses and everything appears to match up with the ARP table on the Cisco ASA firewall. I'm at a loss in trying to figure out what is causing the problem. We thought someone might have been spoofing the MAC address, so then we changed the MAC address on the computer, but this still did not resolve the problem. I've had Cisco look at our firewall config and they said the config was fine. Thanks for any help in advance.
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