- 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.
Port 2855: MSRP over TCP
Port 2855 is assigned by IANA to msrp (MSRP over TCP).
2855
How msrp works
Other servicesThe 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
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:
IANA registry entries for port 2855
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| msrp | 2855 | TCP | MSRP over TCP | RFC 4976 | 2014-04-09 |
| - | 2855 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 2855, and is it reachable?
Linux
sudo ss -ltnup 'sport = :2855' # process listening on 2855
sudo lsof -nP -i :2855macOS
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
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.
Other other services ports
: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