Greetings, all. I'm wondering if someone may have some insight in to an NFS related problem. I have an embedded system running Linux. I set it as an NFS server. I have been able to have the server mount its own share and I have also been able to mount the share on my desktop. That tells me the NFS configuration is fundamentally working. The problem is when I try to mount the from an old industrial system running Hummingbird NFS Maestro DOS based software from 1997. That system is able to ping the server so I know it has a network connection. However, when the "nfs link Z: \\192.168.100.110\/share" command is issue I just get the message on the server saying "No response from server". The Linux NFS server is supposed to support NFS v2 through v4. The old system is probably v3 at best and the logs only seem to indicate v2. I haven't figured out how to disable v4 support on the NFS server. I used tshark to capture the NFS traffic. When the "exports" command was issued on the old machine: 909 873.726802357 192.168.100.101 → 192.168.100.110 Portmap 98 V2 GETPORT Call MOUNT(100005) V:1 UDP 910 873.727576161 192.168.100.110 → 192.168.100.101 Portmap 70 V2 GETPORT Reply (Call In 909) Port:53625 911 873.728326009 192.168.100.101 → 192.168.100.110 MOUNT 110 V1 EXPORT Call 912 873.731315731 192.168.100.110 → 192.168.100.101 MOUNT 142 V1 EXPORT Reply (Call In 911) When the "nfs link" command was issued on the old machine: 915 929.199301001 192.168.100.101 → 192.168.100.110 Portmap 98 V2 GETPORT Call HCLNFSD(788585389) V:1 UDP 916 929.199993392 192.168.100.110 → 192.168.100.101 Portmap 70 V2 GETPORT Reply (Call In 915) PROGRAM_NOT_AVAILABLE 917 929.200757113 192.168.100.101 → 192.168.100.110 Portmap 98 [RPC retransmission of #915]V2 GETPORT Call (Reply In 916) HCLNFSD(788585389) V:1 UDP 918 929.201092226 192.168.100.110 → 192.168.100.101 Portmap 70 [RPC duplicate of #916]V2 GETPORT Reply (Call In 915) PROGRAM_NOT_AVAILABLE 919 929.201744034 192.168.100.101 → 192.168.100.110 Portmap 98 [RPC retransmission of #915]V2 GETPORT Call (Reply In 916) PCNFSD(150001) V:2 UDP The output from rpcinfo is: $ rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper 100024 1 udp 57318 status 100024 1 tcp 46225 status 100005 1 udp 53625 mountd 100005 1 tcp 40199 mountd 100005 2 udp 53980 mountd 100005 2 tcp 53443 mountd 100005 3 udp 50848 mountd 100005 3 tcp 49067 mountd 100003 2 tcp 2049 nfs 100003 3 tcp 2049 nfs 100003 4 tcp 2049 nfs 100227 2 tcp 2049 100227 3 tcp 2049 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100227 2 udp 2049 100227 3 udp 2049 100021 1 udp 42943 nlockmgr 100021 3 udp 42943 nlockmgr 100021 4 udp 42943 nlockmgr 100021 1 tcp 44539 nlockmgr 100021 3 tcp 44539 nlockmgr 100021 4 tcp 44539 nlockmgr Is the DOS based NFS client compatible with current day Linux NFS server? Any idea why I see messages saying PROGRAM_NOT_AVAILABLE? If something is supposedly missing, what program is it looking for? It would have been a lot more helpful if whatever program is reporting a "missing program" said what program it couldn't find, or couldn't talk to. -- Cheers! Kevin. http://www.ve3syb.ca/ | "Nerds make the shiny things that https://www.patreon.com/KevinCozens | distract the mouth-breathers, and | that's why we're powerful" Owner of Elecraft K2 #2172 | #include <disclaimer/favourite> | --Chris Hardwick