Hi,
1. Error Message %PIX-4-405001: Received ARP {request | response} collision from IP_address/mac_address on interface interface_name
Explanation
The firewall received an ARP packet, and the MAC address in the packet differs from the ARP cache entry.
Recommended Action
This traffic might be legitimate, or it might indicate that an ARP poisoning attack is in progress. Check the source MAC address to determine where the packets are coming from and check to see if it belongs to a valid host.
2. Please verify the interface error counters, maybee one Interface is exhausted an not able to receive the failover hello messages.
http://www.cisco.com/en/US/partner/products/hw/vpndevc/ps2030/products_field_notice09186a00800949ca.shtml
Please verify this with show blocks ------------------
SIZE MAX LOW CNT
4 1600 1521 1600
80 400 358 399
256 1012 723 1012
1550 2341 0 1568
If you see the zero than you have following problems.
1. too much traffic
2. faulty hardware
Regards,
Dirk