Sometimes it is the blindingly obvious that gets you. After running into issues with creating a mount point for ISO images to be used by the host servers, we ran into a couple of problems.
Firstly, -t smbfs now appears to be deprecated, so -t cifs should be used instead.
Secondly, smbclient traffic is blocked by the firewall by default, and all you will get when trying to make the connection is:
mount error 111 = Connection refused
To resolve this, simply go into the configuration for the host, security profile and make sure to enable smbclient.
