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// Other services

Port 2159: GDB Remote Debug Port

Port 2159 is assigned by IANA to gdbremote (GDB Remote Debug Port).

2159

How gdbremote works

Other services
client:2159gdbremoteresponse client:2159gdbremoteresponse

The client sends a request to port 2159 and the gdbremote 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 2159 dangerous?

We have no specific security note for port 2159. 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 2159

ServicePortTransportDescriptionReferenceUpdated
gdbremote 2159 TCP, UDP GDB Remote Debug Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2159, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2159'      # process listening on 2159
sudo lsof -nP -i :2159

macOS

sudo lsof -nP -i :2159

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2159 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2159
netstat -ano | findstr :2159

From another machine

nmap -p 2159 -sV <host>
sudo nmap -sU -p 2159 <host>
nc -zv <host> 2159

Block it in the firewall

sudo ufw deny 2159/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2159" -Direction Inbound -LocalPort 2159 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2159 used for?

Port 2159 is assigned by IANA to gdbremote (GDB Remote Debug Port).

Is port 2159 TCP or UDP?

Port 2159 is registered for TCP and UDP.

Is it safe to open port 2159?

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 2159 is open?

On Linux run "ss -ltnup 'sport = :2159'", on macOS "lsof -nP -i :2159", and on Windows "netstat -ano | findstr :2159" to see the local process. From another machine, "nmap -p 2159 <host>" shows whether it is reachable.

05 Related
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