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I am struggling to create an NFS mount from my Mac to a Ubuntu server (the mount works if I do it locally on the server to itself, so I'm confident the issue is network related), and I need to have some visibility on incoming traffic to the server - specifically if any connections are being dropped or rejected due to firewall rules I may not be aware of.

Any ideas how I achieve this?

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Assuming you're referring to the Ubuntu server iptables firewall, there's a similar question here.

It suggests you add a TRACE or use iptables -L -v -n | less to have a better insight into existing rules.

To see the log updated in real time you would then tail -F /var/log/kern.log unless you specified a different log file for your firewall.

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    Yes! The realtime trace using 'tail' has worked for me. Nice one ;-)
    – HomerPlata
    Commented Feb 24, 2017 at 11:26

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