- 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 41121: Tentacle Server
Port 41121 is assigned by IANA to tentacle (Tentacle Server).
41121
How tentacle works
Other servicesThe client sends a request to port 41121 and the tentacle 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 41121 dangerous?
We have no specific security note for port 41121. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 41121
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| tentacle | 41121 | TCP | Tentacle Server | - | 2009-06-02 |
| - | 41121 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 41121, and is it reachable?
Linux
sudo ss -ltnup 'sport = :41121' # process listening on 41121
sudo lsof -nP -i :41121macOS
sudo lsof -nP -i :41121
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 41121 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 41121 netstat -ano | findstr :41121
From another machine
nmap -p 41121 -sV <host> nc -zv <host> 41121
Block it in the firewall
sudo ufw deny 41121/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 41121" -Direction Inbound -LocalPort 41121 -Protocol TCP -Action Block # Windows
What is port 41121 used for?
Port 41121 is assigned by IANA to tentacle (Tentacle Server).
Is port 41121 TCP or UDP?
Port 41121 is registered for TCP.
Is it safe to open port 41121?
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 41121 is open?
On Linux run "ss -ltnup 'sport = :41121'", on macOS "lsof -nP -i :41121", and on Windows "netstat -ano | findstr :41121" to see the local process. From another machine, "nmap -p 41121 <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