CyberHunter
Local dataset, no network
// Other services

Port 9902: enrp/tls server channel

Port 9902 is assigned by IANA to enrp-sctp-tls (enrp/tls server channel).

9902

How enrp-sctp-tls works

Other services
client:9902enrp-sctp-tlsresponse client:9902enrp-sctp-tlsresponse

The client sends a request to port 9902 and the enrp-sctp-tls service answers.

Transport
SCTP
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 9902 dangerous?

We have no specific security note for port 9902. 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 9902

ServicePortTransportDescriptionReferenceUpdated
enrp-sctp-tls 9902 SCTP enrp/tls server channel RFC 5353 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9902, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9902'      # process listening on 9902
sudo lsof -nP -i :9902

macOS

sudo lsof -nP -i :9902

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9902 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9902
netstat -ano | findstr :9902

From another machine

nmap -p 9902 -sV <host>
nc -zv <host> 9902

Block it in the firewall

sudo ufw deny 9902/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9902" -Direction Inbound -LocalPort 9902 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 9902 used for?

Port 9902 is assigned by IANA to enrp-sctp-tls (enrp/tls server channel).

Is port 9902 TCP or UDP?

Port 9902 is registered for SCTP.

Is it safe to open port 9902?

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 9902 is open?

On Linux run "ss -ltnup 'sport = :9902'", on macOS "lsof -nP -i :9902", and on Windows "netstat -ano | findstr :9902" to see the local process. From another machine, "nmap -p 9902 <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

Latest vulnerability news

All news