No such security service available

Hello list,

I am trying to write a program that uses SNMP SET (v3) to modify an
agent's configuration. Being a total SNMP newbie, I took the example
code from the wiki and re-wrote it to perform a SET instead of a GET.
You can look at the resulting source, a little condensed, here:
http://pastebin.com/m2dbf4e2d

Now here's the problem: Whenever my program attempts to send the SET
message, I get the following output on stderr:

no such security service available: 3
snmp_build: unknown failure

Accordingly, snmp_synch_response returns 1 and the response PDU is NULL.

Now I'm wondering: What might cause this error? I am positive that there
is a compatible agent at the address I am sending to, because I can go
on the console and run

snmpget -v 3 -l authNoPriv -u [SNMP_USERNAME] -a MD5 -A [SNMP_PASSWORD]
[address] [MYOID1]

and get a proper response.

(BTW, I have noticed the behavior is exactly the same when I try to send
to an unreachable address. Is it OK that I can snmp_open a session even
if the remote host is down or firewalled?)

Any advice would be greatly appreciated.

Best regards,
Ulrich

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