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// Other services

Port 2655: UNIX Nt Glue

Port 2655 is assigned by IANA to unglue (UNIX Nt Glue).

2655

How unglue works

Other services
client:2655unglueresponse client:2655unglueresponse

The client sends a request to port 2655 and the unglue 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 2655 dangerous?

We have no specific security note for port 2655. 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 2655

ServicePortTransportDescriptionReferenceUpdated
unglue 2655 TCP, UDP UNIX Nt Glue - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2655, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2655'      # process listening on 2655
sudo lsof -nP -i :2655

macOS

sudo lsof -nP -i :2655

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2655 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2655
netstat -ano | findstr :2655

From another machine

nmap -p 2655 -sV <host>
sudo nmap -sU -p 2655 <host>
nc -zv <host> 2655

Block it in the firewall

sudo ufw deny 2655/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2655" -Direction Inbound -LocalPort 2655 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2655 used for?

Port 2655 is assigned by IANA to unglue (UNIX Nt Glue).

Is port 2655 TCP or UDP?

Port 2655 is registered for TCP and UDP.

Is it safe to open port 2655?

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 2655 is open?

On Linux run "ss -ltnup 'sport = :2655'", on macOS "lsof -nP -i :2655", and on Windows "netstat -ano | findstr :2655" to see the local process. From another machine, "nmap -p 2655 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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