Can no longer mount cifs NAS

[philled]

I have two machines running Proxmox which until recently were both capable of mounting a share on my NAS with the following command:

# mount -t cifs //192.168.2.184/home /mnt/disk/ -o credentials=/home/phill/.nas_credentials-phill

My test Proxmox server can still mount the NAS, but my production Proxmox server no longer can for some reason. I get this error:

mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

The host isn't down (I can still mount it right now on the test server). Both are running Proxmox 5.0. I've just rebooted the production server but I'm still getting the same problem. And I've applied the latest updates.

Can anyone advise what the problem might be here?

 

[philled]

Many apologies, but I've found a solution to this - already! When I tagged my post I found another one with the same error which advised specifying the samba protocol as 1.0. See https://forum.proxmox.com/threads/pve-5-1-cifs-share-issue-mount-error-112-host-is-down.37788/

This raises a couple of interesting points:
1) I didn't realise I had upgraded to 5.1. It must have happened as part of an apt update && apt upgrade process. I thought I would have to do a dist-upgrade, but anyway...
2) Before I posted I searched the forums for the error message I had been getting, but no results were returned which is why I posted. But if there's a tag of "mount error(112): host is down" surely the search should return something when looking for this?