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// Other services

Port 1377: Cichlid License Manager

Port 1377 is assigned by IANA to cichlid (Cichlid License Manager).

1377

How cichlid works

Other services
client:1377cichlidresponse client:1377cichlidresponse

The client sends a request to port 1377 and the cichlid 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 1377 dangerous?

We have no specific security note for port 1377. 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 1377

ServicePortTransportDescriptionReferenceUpdated
cichlid 1377 TCP, UDP Cichlid License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1377, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1377'      # process listening on 1377
sudo lsof -nP -i :1377

macOS

sudo lsof -nP -i :1377

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1377 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1377
netstat -ano | findstr :1377

From another machine

nmap -p 1377 -sV <host>
sudo nmap -sU -p 1377 <host>
nc -zv <host> 1377

Block it in the firewall

sudo ufw deny 1377/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1377" -Direction Inbound -LocalPort 1377 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1377 used for?

Port 1377 is assigned by IANA to cichlid (Cichlid License Manager).

Is port 1377 TCP or UDP?

Port 1377 is registered for TCP and UDP.

Is it safe to open port 1377?

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 1377 is open?

On Linux run "ss -ltnup 'sport = :1377'", on macOS "lsof -nP -i :1377", and on Windows "netstat -ano | findstr :1377" to see the local process. From another machine, "nmap -p 1377 <host>" shows whether it is reachable.

05 Related
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