What port does NFS use?
NFS uses port 2049 over TCP/UDP.
| Port | Protocol | Name | What it is for |
|---|---|---|---|
| 2049 | TCP/UDP | NFS | Network File System — Unix file sharing. |
Exposing it
Traditional NFS trusts client-supplied user IDs. Use NFSv4 with Kerberos, or keep it on a trusted network.
Checking it is listening
sudo lsof -i :2049 # macOS, Linux
netstat -ano | findstr :2049 # Windows
nc -zv host 2049 # from elsewhereAn "address already in use" error on a port nothing appears to be holding usually means the socket is in TIME_WAIT rather than that a process has it — the ports reference covers that and the ephemeral range.
Frequently asked questions
What port does NFS use?
NFS uses port 2049 over TCP/UDP. Network File System — Unix file sharing.
Is port 2049 safe to expose to the internet?
Traditional NFS trusts client-supplied user IDs. Use NFSv4 with Kerberos, or keep it on a trusted network.
How do I check whether NFS is listening?
sudo lsof -i :2049 on macOS or Linux, netstat -ano | findstr :2049 on Windows. From another machine, nc -zv host 2049 says whether anything answers.
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