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// Other services

Port 2855: MSRP over TCP

Port 2855 is assigned by IANA to msrp (MSRP over TCP).

2855

How msrp works

Other services
client:2855msrpresponse client:2855msrpresponse

The client sends a request to port 2855 and the msrp service answers.

Transport
TCP
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 2855 dangerous?

We have no specific security note for port 2855. 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 2855

ServicePortTransportDescriptionReferenceUpdated
msrp 2855 TCP MSRP over TCP RFC 4976 2014-04-09
-2855-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 2855, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2855'      # process listening on 2855
sudo lsof -nP -i :2855

macOS

sudo lsof -nP -i :2855

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2855 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2855
netstat -ano | findstr :2855

From another machine

nmap -p 2855 -sV <host>
nc -zv <host> 2855

Block it in the firewall

sudo ufw deny 2855/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2855" -Direction Inbound -LocalPort 2855 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2855 used for?

Port 2855 is assigned by IANA to msrp (MSRP over TCP).

Is port 2855 TCP or UDP?

Port 2855 is registered for TCP.

Is it safe to open port 2855?

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 2855 is open?

On Linux run "ss -ltnup 'sport = :2855'", on macOS "lsof -nP -i :2855", and on Windows "netstat -ano | findstr :2855" to see the local process. From another machine, "nmap -p 2855 <host>" shows whether it is reachable.

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