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// Other services

Port 106: 3COM-TSMUX

Port 106 is assigned by IANA to 3com-tsmux (3COM-TSMUX).

106

How 3com-tsmux works

Other services
client:1063com-tsmuxresponse client:1063com-tsmuxresponse

The client sends a request to port 106 and the 3com-tsmux 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 106 dangerous?

We have no specific security note for port 106. 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 106

ServicePortTransportDescriptionReferenceUpdated
3com-tsmux 106 TCP, UDP 3COM-TSMUX
Reported: Known Unauthorized Use on 106
 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 106, and is it reachable?

Linux

sudo ss -ltnup 'sport = :106'      # process listening on 106
sudo lsof -nP -i :106

macOS

sudo lsof -nP -i :106

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 106 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 106
netstat -ano | findstr :106

From another machine

nmap -p 106 -sV <host>
sudo nmap -sU -p 106 <host>
nc -zv <host> 106

Block it in the firewall

sudo ufw deny 106/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 106" -Direction Inbound -LocalPort 106 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 106 used for?

Port 106 is assigned by IANA to 3com-tsmux (3COM-TSMUX).

Is port 106 TCP or UDP?

Port 106 is registered for TCP and UDP.

Is it safe to open port 106?

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 106 is open?

On Linux run "ss -ltnup 'sport = :106'", on macOS "lsof -nP -i :106", and on Windows "netstat -ano | findstr :106" to see the local process. From another machine, "nmap -p 106 <host>" shows whether it is reachable.

05 Related
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