[SNMP4J] can't query AES192 and AES256 with Snmp4j

[Elad Sarver (esarver)]

Hi,
 
I am using V1.7.1.
When I use the snmp4j.exe tool to query a Cisco device using AES128
encryption, it works.
When I try to use the same for AES192 or AES256, the device doesn't
respond. even not with a Report PDU (used ethereal, saw that an
encrypted PDU was sent to the device and nothing came back).
 
I have the security policy files installed. Before they were installed,
a different error had occured. So it probably isn't the reason.
The device is configured correctly, and traps/informs are being sent
from it with AES192 and the right credentials.
 
What is the problem?