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// Other services

Port 1155: Network File Access

Port 1155 is assigned by IANA to nfa (Network File Access).

1155

How nfa works

Other services
client:1155nfaresponse client:1155nfaresponse

The client sends a request to port 1155 and the nfa service answers.

Transport
TCP · UDP
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
Other services
01 Security

Is port 1155 dangerous?

We have no specific security note for port 1155. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1155

ServicePortTransportDescriptionReferenceUpdated
nfa 1155 TCP, UDP Network File Access - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1155, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1155'      # process listening on 1155
sudo lsof -nP -i :1155

macOS

sudo lsof -nP -i :1155

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1155 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1155
netstat -ano | findstr :1155

From another machine

nmap -p 1155 -sV <host>
sudo nmap -sU -p 1155 <host>
nc -zv <host> 1155

Block it in the firewall

sudo ufw deny 1155/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1155" -Direction Inbound -LocalPort 1155 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1155 used for?

Port 1155 is assigned by IANA to nfa (Network File Access).

Is port 1155 TCP or UDP?

Port 1155 is registered for TCP and UDP.

Is it safe to open port 1155?

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. Close the port if nothing on the host needs it.

How do I check if port 1155 is open?

On Linux run "ss -ltnup 'sport = :1155'", on macOS "lsof -nP -i :1155", and on Windows "netstat -ano | findstr :1155" to see the local process. From another machine, "nmap -p 1155 <host>" shows whether it is reachable.

05 Related
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