Nagios Support Forum

Are you sure that your credentials are correct? Can you run snmpwalk using same credentials?

I finally have a breakthrough:

The above command you asked me to try didn't work:
snmpwalk -v 3 -u snmprouser -l authNoPriv -a MD5 -A snmpgdi 123 192.168.13.20

But the following worked:
snmpwalk -v3 -u snmprouser -l AuthPriv -a md5 -A snmpgdi123 -x des -X snmpgdi123 192.168.13.20

..and then I tried the plugin and that worked as well!:
/usr/local/nagios/libexec/check_ifoperstatnag 10101 -v 3 -u snmprouser -A snmpgdi123 -x DES -X snmpgdi123 -a MD5 -l AuthPriv 192.168.13.20
OK - Interface 10101 is up.

I guess that solves my issue for now, but I will try to investigate why the wizard wasn't generating the right command and will post here.

I am glad you issue has been resolved!

I will try to investigate why the wizard wasn't generating the right command and will post here.

Try rerunning the wizard (set up a different host name) to see if your checks will be configured properly and let us know.

We tried with different switches and they are all working now!

I was not able to figure out why they weren't working before.

Thanks anyway!

Are we all set to close the thread?

I know that this thread is quite old, but I ran into this same issue. It turns out that my passwords were too short.
Passwords as per RFC 2574
https://www.ietf.org/rfc/rfc2574.txt
Page 70
11.2 Defining Users
Paragraph 2
Requires that all SNMPv3 passwords be at least 8 characters long.
I made my two passwords longer than 8 characters and it fixed my problem.
Maybe someone else can find this useful.

Thanks stilpete for the tip, it should help out other users with similar issues.