mcaAIM and nmcDemo not finding AIM 556 on new linux install

[Hank Ball via Tech-talk <tech-talk at aps.anl.gov>]

I've been working on building EPICS on a Debian 12 system with the 
latest releases of mca (7-10) and base (7.0.8).
I'm hoping someone can help me please with mca ethernet connection 
problem I'm having.
When I try to connect to a Canberra AIM 556 with nmcDemo I get this 
response:
root@debian:/home/hank/epics# nmcDemo enp2s0 0x205
Using AIM-Module 205
Calling nmc_initialize ...
(nmc_initialize): waiting returned 1
Calling nmc_build_enet_addr ...
Calling nmc_findmod_by_addr ...

I get a similar result when using mcaAIM:

......
AIMConfig("AIM1/1", 0x205, 2, 512, 1, 1, "enp2s0")
(nmc_initialize): waiting returned 1
AIMConfig ERROR: cannot find module on the network!
.......

It may be helpful to add that mcaAmptekApp does work correctly and 
communicates fine with an Amptek DP5.
As evidence that the AIM 556 is working, I have an older system running 
Debian 9 and built with base-3.14.12.4 and mcaR7-6 that has no problems 
with either nmcDemo or mcaAIM.  (This computer has a different ethernet 
interface name, enp3s0 vs enp2s0.)
root@lab1:/home/hank/epics# nmcDemo enp3s0 0x205
Using AIM-Module 205
Calling nmc_initialize ...
Calling nmc_build_enet_addr ...
Calling nmc_findmod_by_addr ...
Calling nmc_buymodule ...
Calling nmc_show_modules ...
Module     Type  HW rev.  FW rev.  Owner name      Owner ID Status      
Memory size Free address
NI00801c    1       2        7                 00:00:00:00:00:00 
Reachable     262140      00000000
NI000205    1       0        6       lab1      90:2B:34:13:12:C0 
Reachable     261116      00000000
Calling nmc_addeventsem ...
Calling nmc_acqu_setup ...
Calling nmc_acqu_setstate(0) ...
Calling nmc_acqu_erase ...
Calling nmc_acqu_setelapsed ...
Calling nmc_setstate(1) ...
Waiting for event flag or timeout.  Should complete in 10 seconds.
Calling nmc_statusupdate ...
Calling nmc_acqu_getmemory_cmp ...
Time for nmc_acqu_getmemory_cmp = 0.071970
Calling nmc_acqu_getmemory ...
Time for nmc_acqu_getmemory = 0.191984
Total counts were 0; Real time = 10.00, Live time=9.99
Calling nmc_freemodule ...
Calling nmc_show_modules ...
Module     Type  HW rev.  FW rev.  Owner name      Owner ID Status      
Memory size Free address
NI00801c    1       2        7                 00:00:00:00:00:00 
Reachable     262140      00000000
NI000205    1       0        6                 00:00:00:00:00:00 
Reachable     261116      00000000
Thanks for any suggestions,

Hank