Trap - AuthentificationFailure

[niak]

hi everybody,

I am under zabbix 1.4.4 and since recently i have some trap with authentificationFailure.
I don't understand why this message sudently appears.

Here is the message:

HOST=xxx.yyy.local UDP: [192.168.1.82]:1091 sysUpTimeInstance = 39:10:57:53.97 TRAP OID=snmpTrapOID.0 = authenticationFailure PAYLOAD=snmpTrapEnterprise.0 = enterprises.311.1.1.3.1.2 snmptraps

Does anyone has an idea why i have this trap.