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Port 20049 (nfsrdma)

IANA assigns port 20049 to nfsrdma: Network File System (NFS) over RDMA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nfsrdma TCP Network File System (NFS) over RDMA - RFC 8267
nfsrdma UDP Network File System (NFS) over RDMA - RFC 8267
nfsrdma SCTP Network File System (NFS) over RDMA - RFC 8267

Registry dates for this port: last modified 2017-09-05.

Check what is listening on port 20049

Linux: is anything listening on TCP 20049?
sudo ss -tlnp 'sport = :20049'
Linux: UDP 20049
sudo ss -ulnp 'sport = :20049'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20049
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20049 '
Windows (Command Prompt)
netstat -ano | findstr :20049
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20049 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20049
From Windows
Test-NetConnection HOST -Port 20049
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 20049

Block port 20049 in the firewall

ufw
sudo ufw deny 20049/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20049 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20049 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20049' -Direction Inbound -Protocol TCP -LocalPort 20049 -Action Block
ufw
sudo ufw deny 20049/udp
iptables
sudo iptables -A INPUT -p udp --dport 20049 -j DROP
nftables
sudo nft add rule inet filter input udp dport 20049 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 20049' -Direction Inbound -Protocol UDP -LocalPort 20049 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.