I've been trying to get my APC SNMP v3 UPS to work with NUT (network UPS tools) on FreeBSD 11.2. It's not detecting it.

What I've done so far

• Clean install FreeBSD 11.2 AMD64 and check UPS pingable


• install NUT:
  pkg install nut
  


• create config file (contents below)
  ee /usr/local/etc/nut/ups.conf
  


• run upsdrvctl start to test driver connectivity, as advised by NUT docs


• result: "No supported device detected"


• run tcpdump in background to check if it's failing to connect:
  tcpdump host <UPS_IP_ADDRESS> &
upsdrvctl start
  


• 
  

  output (both tcpdump and upsdrvctl):

  
  
  
  
  
  1. IP "GetRequest" packet from FreeBSD svr to correct UPS IP on SNMP port
  
  
  2. ARP "who-has" packet from UPS to identify FreeBSD server's MAC
  
  
  3. IP packet reply from UPS SNMP port to FreeBSD server
  
  
  4. FreeBSD server reports "No supported devices detected"
  
  
  
  

So the UPS is in fact able to be communicated with. But the device is apparently well supported, it's a pretty ordinary APC SMT 3000 series UPS with APC9630 network card, which is also well supported by NUT and has been for years. The auth/privProtocols are also apparently well supported according to the mailing list, again for a long time.

ups.conf config file contents:

[apc-smt3000]



driver=snmp-ups

port=x.x.x.x

snmp_version=v3



desc="APC SMT3000"



secLevel=authPriv

secName="UPS_SNMP_PROFILE_NAME"

authPassword="PASSWORD"

privPassword="PASSWORD"



snmp_retries = 0

snmp_timeout=3



authProtocol=SHA

privProtocol=AES

I've checked the passwords, protocols and config on both UPS and server, they all look OK.

How can I troubleshoot this to find why they aren't talking?