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// File transfer & sharing

Port 20049: Network File System (NFS) over RDMA

Port 20049 is assigned by IANA to nfsrdma (Network File System (NFS) over RDMA).

20049

How nfsrdma works

File transfer & sharing
client:200491/32/33/3nfsrdma client:200491/32/33/3nfsrdma

Files are sent over port 20049 in pieces and reassembled on the other side.

Transport
TCP · UDP · SCTP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
File transfer & sharing
01 Security

Is port 20049 dangerous?

We have no specific security note for port 20049. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 20049

ServicePortTransportDescriptionReferenceUpdated
nfsrdma 20049 TCP, UDP, SCTP Network File System (NFS) over RDMA RFC 8267 2017-09-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 20049, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20049'      # process listening on 20049
sudo lsof -nP -i :20049

macOS

sudo lsof -nP -i :20049

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20049 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20049
netstat -ano | findstr :20049

From another machine

nmap -p 20049 -sV <host>
sudo nmap -sU -p 20049 <host>
nc -zv <host> 20049

Block it in the firewall

sudo ufw deny 20049/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20049" -Direction Inbound -LocalPort 20049 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20049 used for?

Port 20049 is assigned by IANA to nfsrdma (Network File System (NFS) over RDMA).

Is port 20049 TCP or UDP?

Port 20049 is registered for TCP and UDP and SCTP.

Is it safe to open port 20049?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 20049 is open?

On Linux run "ss -ltnup 'sport = :20049'", on macOS "lsof -nP -i :20049", and on Windows "netstat -ano | findstr :20049" to see the local process. From another machine, "nmap -p 20049 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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