Trying to mount an NFS share between two openvms systems, but getting a SYSTEM-F-TIMEOUT message

[JeradMason]

Running OpenVMS V8.4-2L1.

I've setup an OpenVMS NFS share before, but recently had to remove the settings. I'mv trying to re-add the settings from my notes, but it keeps timing out and the mounting phase. If I start logging on the NFS server, it shows the client mounting successfully but dismounting seconds later. These are the commands i've run:

NFS Server:

ADD PROXY CONCERO /HOST=HOSTDR1-BACKUP /UID=600 /GID=600

MAP "/DKC0" DKC0:

ADD EXPORT "/DKC0" /HOST=HOST9-BACKUP

NFS Client :

MOUNT DNFS1: /HOST=HOSTDR-BACKUP /PATH="/DKC0" /OWNER_UIC=[600,600] /USER=CONCERO /UID=600 /GID=600

Thanks for your time.

[JeradMason]

I've restarted the NFS server daemon, which seems to have done something. I now get the message: 

"...-SYSTEM-F-NOSUCHOBJ, network object is unknown at remote node"

running REPLY/ENABLE gets me the following on the server:

$
%%%%%%%%%%% OPCOM 30-SEP-2019 15:00:27.07 %%%%%%%%%%%
Message from user TCPIP$NFS on HOSTDR
%TCPIP-S-NFS_MNTSUC, mounted file system /DKC0
-TCPIP-S-NFS_CLIENT, uid=1 gid=1 host_name = HOST9-BACKUP

$
%%%%%%%%%%% OPCOM 30-SEP-2019 15:00:27.07 %%%%%%%%%%%
Message from user TCPIP$NFS on HOSTDR
%TCPIP-S-NFS_UMNSUC, file system /DKC0 is unmounted
-TCPIP-S-NFS_CLIENT, uid=600 gid=600 host_name = HOST9-BACKUP