Port 2049 – NFS Protocol Specification

Technical analysis, security advisories, vulnerability mitigation, and firewall syntax for TCP/UDP port 2049 (NFS).

Port Number 2049

Transport Protocol TCP/UDP

Port Range Type Registered (1024-49151)

Default Status Restricted / LAN

Service Description & Architectural Context

Network File System for network-attached Unix storage mounts.

IANA / RFC Designation:

Port 2049 is assigned to NFS under the Internet Assigned Numbers Authority (IANA) service name registry. In enterprise infrastructure and homelab setups, services listening on this port must follow the principle of least privilege.

Security Analysis & Attack Surface Assessment

Restrict exports by IP/CIDR in /etc/exports; use NFSv4 with Kerberos (krb5p).

Hardening Recommendations:

Do not expose port 2049 to public WAN interfaces unless authenticated TLS or VPN wrapping is strictly enforced.
Enforce rate-limiting using Fail2ban, CrowdSec, or cloud edge DDoS protection.
Audit active listening sockets locally: ss -tulpn | grep :2049 or netstat -ano | findstr :2049.

Firewall Rule Snippets for Port 2049

UFW (Ubuntu / Debian Linux)

sudo ufw allow 2049/tcp

iptables (Standard Linux Kernel)

sudo iptables -A INPUT -p tcp --dport 2049 -j ACCEPT

Windows PowerShell (Defender Advanced Firewall)

New-NetFirewallRule -DisplayName "Allow Port 2049" -Direction Inbound -LocalPort 2049 -Protocol TCP -Action Allow

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