CyberHunter
Local dataset, no network
// Other services

Port 2837: Repliweb

Port 2837 is assigned by IANA to repliweb (Repliweb).

2837

How repliweb works

Other services
client:2837repliwebresponse client:2837repliwebresponse

The client sends a request to port 2837 and the repliweb 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 2837 dangerous?

We have no specific security note for port 2837. 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 2837

ServicePortTransportDescriptionReferenceUpdated
repliweb 2837 TCP, UDP Repliweb - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2837, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2837'      # process listening on 2837
sudo lsof -nP -i :2837

macOS

sudo lsof -nP -i :2837

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2837 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2837
netstat -ano | findstr :2837

From another machine

nmap -p 2837 -sV <host>
sudo nmap -sU -p 2837 <host>
nc -zv <host> 2837

Block it in the firewall

sudo ufw deny 2837/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2837" -Direction Inbound -LocalPort 2837 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2837 used for?

Port 2837 is assigned by IANA to repliweb (Repliweb).

Is port 2837 TCP or UDP?

Port 2837 is registered for TCP and UDP.

Is it safe to open port 2837?

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 2837 is open?

On Linux run "ss -ltnup 'sport = :2837'", on macOS "lsof -nP -i :2837", and on Windows "netstat -ano | findstr :2837" to see the local process. From another machine, "nmap -p 2837 <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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