Hi Brian, The engine ID is set in the USM on Java appliaction and in the Wireshark it looks like it is correct and the snmptrapd daemon receives authPriv traps (with defined engine ID) from Java app correctly.
I will try to use snmp4j logging to detect the error. Best regards, Michael From: Atkins, Brian <brian.atk...@netapp.com> Sent: Wednesday, March 31, 2021 2:47 PM To: Michał Tarczyński <michal.tarczyn...@radmor.com.pl>; 'Frank Fock' <f...@agentpp.com> Cc: net-snmp-users@lists.sourceforge.net Subject: RE: Problem with SNMPv3 traps with authentication But with noAuthNoPriv, the encoded passphrases aren’t being sent, and the receiver is not trying to decode them. When an authPriv trap is received, the trap receiver uses the authoritative engine ID to decode the passphrases and ensure they match the preconfigured USM user’s passphrases, which must have been encoded using the trap sender’s engine ID (which is authoritative). Perhaps snmp4j in your receiver is using its own generated engine ID by default, so you may need to ensure the creation of the USM users on the trap receiver actually used the engine ID of the trap sender (and the correct passphrases, of course). I would also look into whether snImp4j has diagnostic/debug logging that can be enabled while your developing. That might reveal were the problem lies. Brian
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