Error reading 7i76e board

Have an existing parport install that I am changing to a 7i76E card. Am also installing from a new PC.
Am initially just trying to get a single Stepper working
When running pnconf the test of the X-Axis fails and when run from the cmd line shows

 **** INFO firmware 0 changed
s-stepgen-step None
s-pwm-pulse None
s-encoder-a None
spindle-enable None
spindle-cw None
spindle-ccw None
spindle-brake None
s-pot-output None
-> GPIO Output GPIO Input 0 mesa0c2pin0
hm2_7i76e.0.gpio.017 x-enable
Note: Using POSIX realtime
iptables: Bad rule (does a matching rule exist in that chain?).
Unexpected realtime delay on task 0 with period 75000
This Message will only display once per session.
Run the Latency Test and resolve before continuing.
hm2/hm2_7i76e.0: error finishing read! iter=6
Note: Using POSIX realtime
/home/hackland/linuxcnc/configs/mechmate
/home/hackland/.pncconf-preferences

Unsure where the IPtables issue is coming from, but is suspect.

I get a similar error when I run linuxcnc
LINUXCNC - 2.8.0
Machine configuration directory is '/home/hackland/linuxcnc/configs/mechmate'
Machine configuration file is 'mechmate.ini'
Starting LinuxCNC...
Found file(REL): ./mechmate.hal
Found file(REL): ./custom.hal
Unexpected realtime delay on task 0 with period 50000
This Message will only display once per session.
Run the Latency Test and resolve before continuing.

hm2/hm2_7i76e.0: error finishing read! iter=6

(0, ' = ', '/usr/bin/gmoccapy')

I am running on 192.168.1.121 (it does not conflict) but have tried 10.10.10.10. With either address
mesaflash --device 7i76e --addr 192.168.1.121 --readhmid
results in the attached log, so comms appears Ok.

I am chasing both the realtime issue and the comms issue. Is it likely that the realltime issue is stopping comms with the Mesa?
Note the CR1 LED is on on the 7i76E card
 

Unexpected realtime delay on task 0 with period 75000

The servo thread should be 1 ms (1000000 ns)

thanks, setting that to 1000000 got rid of the realtime error, and comms is working Ok now