SNMPv3 not working on 3810M

[ClausJP]

Hi All :)

I've a 3810M that is not accepting SNMPv3 requests from my iMC.
The setup is simple and with a SNMP tester I can confirm that it works from both my admin laptop and the iMC server. But not via the iMC program itself.
SNMPv2 works from the iMC.

3810M:

snmpv3 enable
snmpv3 only
snmpv3 group managerpriv user "user" sec-model ver3
snmpv3 user "user"

SHOW SNMPV3 USER

User Name Auth. Protocol Privacy Protocol
-------------------------------- ---------------- ----------------
user SHA CFB AES-128

SHOW SNMPV3 GROUP

Status and Counters - SNMP v3 Global Configuration Information

Security Name Security Model Group Name
----------------------------- -------------- --------------------------------
user ver3 ManagerPriv