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// Other services

Port 9955: Contact Port for AllJoyn multiplexed constrained messaging

Port 9955 is assigned by IANA to alljoyn-mcm (Contact Port for AllJoyn multiplexed constrained messaging), alljoyn-stm (Contact Port for AllJoyn standard messaging).

9955

How alljoyn-mcm works

Other services
client:9955alljoyn-mcmresponse client:9955alljoyn-mcmresponse

The client sends a request to port 9955 and the alljoyn-mcm service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 9955 dangerous?

We have no specific security note for port 9955. 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 9955

ServicePortTransportDescriptionReferenceUpdated
alljoyn-mcm 9955 UDP Contact Port for AllJoyn multiplexed constrained messaging - 2012-03-14
alljoyn-stm 9955 TCP Contact Port for AllJoyn standard messaging - 2012-03-14

// source: IANA service name and port number registry

03 Check it

Which program uses port 9955, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9955'      # process listening on 9955
sudo lsof -nP -i :9955

macOS

sudo lsof -nP -i :9955

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9955 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9955
netstat -ano | findstr :9955

From another machine

nmap -p 9955 -sV <host>
sudo nmap -sU -p 9955 <host>
nc -zv <host> 9955

Block it in the firewall

sudo ufw deny 9955/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9955" -Direction Inbound -LocalPort 9955 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9955 used for?

Port 9955 is assigned by IANA to alljoyn-mcm (Contact Port for AllJoyn multiplexed constrained messaging), alljoyn-stm (Contact Port for AllJoyn standard messaging).

Is port 9955 TCP or UDP?

Port 9955 is registered for UDP and TCP.

Is it safe to open port 9955?

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 9955 is open?

On Linux run "ss -ltnup 'sport = :9955'", on macOS "lsof -nP -i :9955", and on Windows "netstat -ano | findstr :9955" to see the local process. From another machine, "nmap -p 9955 <host>" shows whether it is reachable.

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