Error nfs_access

Access denied by the server

You're connected, but the server won't let the user you present read or write here. NFS has no passwords — the numeric User ID is your identity, and the export may squash it.

What this means

NFS status 13, EACCES. The server checked the numeric User ID / Group ID the app presents against the folder’s owner, group and permissions — and said no.

Why NFS works this way

NFS (the sys flavour every home NAS uses) has no login. The client simply states a UID and GID, and the server takes it at face value — then applies normal Unix permissions, possibly after squashing (remapping) that identity:

• root_squash — UID 0 becomes nobody. On by default everywhere.
• all_squash — every UID becomes one designated user (anonuid/anongid). Then the UID you present doesn’t matter at all; the folder has to be accessible to that designated user.
• No squash — the UID you present is used as-is.

Find out what the server sees

Tap Inspect Server on the server card. It shows You present (your UID/GID), Export owned by (the folder’s owner), the folder’s permission bits, and whether Read and Write actually work — plus a plain-language read on which squash mode you’re hitting. Free, no Pro needed.

Fix it

Option A — present the right UID. On the server, run id yourname to find your numeric UID and GID (the first user on Synology is usually 1026, on most Linux boxes 1000). Put those in the server’s Advanced → User ID / Group ID in NFS Files.

Option B — squash everyone to one user (simplest). Make the export map all clients to a user that owns the folder:

• Synology: NFS rule → Squash: Map all users to admin (or to guest for read-only folders). Then the UID in the app is irrelevant.
• QNAP: NFS host access → Squash option: all_squash, Anonymous UID/GID set to the share’s owner.
• TrueNAS: share → Advanced → Mapall User / Mapall Group set to the owner.
• Unraid: the default rule already does this (all_squash,anonuid=99,anongid=100 = nobody:users); make sure the share’s files are owned by nobody:users (Tools → New Permissions).
• Linux: all_squash,anonuid=1000,anongid=1000 in /etc/exports.

Option C — fix the folder’s permissions on the server so your UID (or group) has access: chmod, chown, or the NAS’s file manager.

Group-owned folders

NFS Files currently sends one group ID. If access depends on a secondary group membership on the server, use Option B or make the folder readable by the primary group. (Extra group IDs are on the roadmap.)

Full background: User IDs and squash.