lockd server not responding truenas

[LearnLearnLearn]

I've searched the net and found a few posts here on this but nothing seems to answer what is happening.
NFS clients keep showing random rpcbind errors in their logs.
I've done basic testing like constant pings and don't see any problems.
I've tested using iperf and all seems fine.

On the clients, I'm seeing: kernel lockd server not responding truenas
On the TN server, I'm seeing.

What is happening? Is the NIC having a problem?

Code:

# tail -n 20 messages
Apr 27 11:29:24 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 11:36:11 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 11:37:11 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 11:41:54 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 11:42:54 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 11:45:14 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 11:46:13 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 11:52:58 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 11:53:58 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 12:06:25 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 12:07:25 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 12:19:34 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 12:20:34 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 13:10:57 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 13:11:57 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 13:17:17 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 13:18:17 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 13:26:11 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416
Apr 27 13:27:11 truenas kernel[1810]: Last message 'NLM: failed to conta' repeated 3 times, suppressed by syslog-ng on truenas.local
Apr 27 13:35:38 truenas kernel: NLM: failed to contact remote rpcbind, stat = 5, port = 28416

 

[callmr]

I have the same problem for a NFS share, which is also shared via SMB (MultiProtocol share)

 

[LearnLearnLearn]

I would not have mentioned it but it seems to be affecting web servers that are sharing html pages.
In my case, NFS only and they seem to lose access.