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// Other services

Port 1955: ABR-Secure Data (diskbridge)

Port 1955 is assigned by IANA to abr-secure (ABR-Secure Data (diskbridge)).

1955

How abr-secure works

Other services
client:1955abr-secureresponse client:1955abr-secureresponse

The client sends a request to port 1955 and the abr-secure 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 1955 dangerous?

We have no specific security note for port 1955. 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 1955

ServicePortTransportDescriptionReferenceUpdated
abr-secure 1955 TCP, UDP ABR-Secure Data (diskbridge) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1955, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1955'      # process listening on 1955
sudo lsof -nP -i :1955

macOS

sudo lsof -nP -i :1955

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1955 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1955
netstat -ano | findstr :1955

From another machine

nmap -p 1955 -sV <host>
sudo nmap -sU -p 1955 <host>
nc -zv <host> 1955

Block it in the firewall

sudo ufw deny 1955/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1955" -Direction Inbound -LocalPort 1955 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1955 used for?

Port 1955 is assigned by IANA to abr-secure (ABR-Secure Data (diskbridge)).

Is port 1955 TCP or UDP?

Port 1955 is registered for TCP and UDP.

Is it safe to open port 1955?

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 1955 is open?

On Linux run "ss -ltnup 'sport = :1955'", on macOS "lsof -nP -i :1955", and on Windows "netstat -ano | findstr :1955" to see the local process. From another machine, "nmap -p 1955 <host>" shows whether it is reachable.

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