I am facing this issue in my snmpv3 deployment. In some of catalyst cisco switches I am using snmpv3 with authpriv as sha and aes256. The porblem is that when I run an snmpwalk for v3 credentials it timesout. Though I have noticed that if i change the authpriv to MD5 and DES it runs fine and results successful.
I wanted to know why this behaviour on IOS accepts the sha/aes but doesn't respond? Any help?