Port 2049Network File System
2049/UDP is commonly used by NFS (Network File System), a protocol developed by Sun Microsystems that enables remote access to shared file systems across a network. It allows systems to mount disks located on remote hosts as seamlessly as if they were part of the local file system hierarchy. This facilitates file sharing, centralized management, and collaboration within distributed network environments..
- transport
- udp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 7,245
single transport
payload readable on path
registered with iana
caution
rank 709 of 993 · top 71%
1 other service is registered on port 2049. compare all 2 →
Technical Details
what runs on :2049Network File System (NFS) operating on port 2049 primarily over UDP, but often supports TCP as well, is a widely used distributed file protocol. Invented by Sun Microsystems, it allows a client machine to access files stored on a remote server as if they were on a local disk, enabling easy sharing and management of file resources across networked UNIX and Linux systems. Administrators can export directories on a server which clients then mount into their own file system trees.
NFS utilizes Remote Procedure Call (RPC) mechanisms to facilitate its communication between clients and servers. Typically, mountd and portmap help negotiate initial connections, but modern NFSv3 and particularly NFSv4 streamline communication by defaulting to the well-known port 2049, without depending on portmap. NFS supports stateless communication in early versions, with improvements for stateful handling, locking, and security features introduced in later versions.
While early versions rely heavily on UDP for lightweight communication, newer implementations commonly favor TCP for reliability, especially across unreliable networks. The protocol is platform-agnostic, extending support beyond UNIX/Linux to other systems, making it a versatile choice for network-attached storage and centralized home or user directories in enterprise and research environments.
Security Information
exposure of :2049risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
file transfer averages 4.1 across 114 ports — this one sits 0.1 below.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
official
registered with iana for this service — scanners fingerprint it by number
reachable over
udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common Vulnerabilities
- Unauthenticated Access: Older NFS setups might allow unauthenticated or poorly authenticated mounts, exposing sensitive data.
- Cleartext Transmission: Traditional NFS traffic is unencrypted, making credentials and data vulnerable to interception via network sniffing.
- Export Misconfiguration: Overly permissive exports or inappropriate wildcard entries in
/etc/exportscan open sensitive directories to unauthorized hosts. - Lack of Integrity Verification: Without additional layers like Kerberos, there’s minimal mechanism to assure integrity or authenticity of the communication, enabling man-in-the-middle attacks.
- RPC Exploits: Vulnerabilities in the underlying RPC services used by NFS can be leveraged for denial of service or remote code execution.
Common Mitigations
- Network Segmentation: Isolate NFS servers within trusted, internal network segments inaccessible from untrusted networks.
- Access Controls: Use precise host restrictions in export configuration, and limit access through firewall rules.
- Encrypt Traffic: Employ NFS over tunnels (IPsec, SSH) or adopt NFSv4 with Kerberos (krb5p) for encryption and integrity.
- Authentication & Authorization: Use Kerberos integration (krb5 or krb5i/p) to enforce strong authentication and data integrity.
- Regular Updates: Keep the NFS server software and its dependencies patched against known vulnerabilities.
- Logging and Monitoring: Enable logging of mount attempts and monitor for unusual activity or access patterns.
Related Ports
the 8 most looked-up other ports in file transfer — 114 ports carry that label.
| port | service | risk | |||
|---|---|---|---|---|---|
| :9080 | Groove RPC | TCPUDP | Web Services | caution | 70.8k |
| :17500 | Dropbox LAN Sync | TCPUDP | File Transfer | caution | 43.7k |
| :548 | Apple Filing Protocol | TCP | File Transfer | caution | 36.8k |
| :7000 | Vuze HTTPS Tracker | TCPtls | Security | caution | 28.9k |
| :1337 | PowerFolder P2P | TCP | Security | caution | 27.1k |
| :9001 | SharePoint Authoring | Web Services | caution | 26.3k | |
| :8080 | FilePhile Relay | UDP | File Transfer | caution | 25.6k |
| :1337 | WASTE Encrypted Sharing | TCP | Security | caution | 22.9k |
risk mix of the 8 listed
- caution100%
1 of 8 encrypted