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// Other services

Port 2880: Synapse Transport

Port 2880 is assigned by IANA to synapse (Synapse Transport).

2880

How synapse works

Other services
client:2880synapseresponse client:2880synapseresponse

The client sends a request to port 2880 and the synapse 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 2880 dangerous?

We have no specific security note for port 2880. 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 2880

ServicePortTransportDescriptionReferenceUpdated
synapse 2880 TCP, UDP Synapse Transport - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2880, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2880'      # process listening on 2880
sudo lsof -nP -i :2880

macOS

sudo lsof -nP -i :2880

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2880 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2880
netstat -ano | findstr :2880

From another machine

nmap -p 2880 -sV <host>
sudo nmap -sU -p 2880 <host>
nc -zv <host> 2880

Block it in the firewall

sudo ufw deny 2880/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2880" -Direction Inbound -LocalPort 2880 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2880 used for?

Port 2880 is assigned by IANA to synapse (Synapse Transport).

Is port 2880 TCP or UDP?

Port 2880 is registered for TCP and UDP.

Is it safe to open port 2880?

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 2880 is open?

On Linux run "ss -ltnup 'sport = :2880'", on macOS "lsof -nP -i :2880", and on Windows "netstat -ano | findstr :2880" to see the local process. From another machine, "nmap -p 2880 <host>" shows whether it is reachable.

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