Hello Rupert,

I might hazard a guess that you open up Windows Firewall with advanced
 security in windows pro 10 and allow the entire dynamic range of  ports
that the port mapper might divert the client to,
or simply allow all traffic to / from the NFS server on the windows clients
(just to test)

I have seen issues with Windows Firewall and some updates
( on windows services that use RPC extensively such as MS SQL / SQL Browser)

if your windows 10 environments are controlled by active directory you
 may have to set the windows
firewall settings in Group Policy (any more than this and im wandering
dangerously off OpenBSD Topic ) :)
I hope this helps

On 14 February 2018 at 15:52, Rupert Gallagher <r...@protonmail.com> wrote:
> This is a recurring problem that is proving hard to fix. When windows 10 pro 
> clients run their security updates and the client restarts, they are unable 
> to reconnect to the nfs server. There is nothing wrong with the network, 
> however, and the nfs servers are up as usual. The only thing that recovers 
> functionality is to stop and restart portmap mountd and nfsd. Am I the only 
> one with this problem?
> Sent from ProtonMail Mobile

Kindest regards,
Tom Smyth

Mobile: +353 87 6193172
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