We're getting the error below (about 3000 per day) on an ASA5520 (7.2.2) when it receives L2L VPN traffic from a PIX-525 (6.3(5)140):
%ASA-4-402120: IPSEC: Received an ESP packet (SPI= 0xB8EE870D, sequence number= 0x534B0) from 10.10.50.4 (user= 10.10.50.4) to 10.10.62.4 that failed authentication.
Both ends are running failover mode. Could this be an issue between PIX-OS versions?
Thanks in advance.