CyberHunter
Local dataset, no network
// Other services

Port 371: Clearcase

Port 371 is assigned by IANA to clearcase (Clearcase).

371

How clearcase works

Other services
client:371clearcaseresponse client:371clearcaseresponse

The client sends a request to port 371 and the clearcase 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 371 dangerous?

We have no specific security note for port 371. 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 371

ServicePortTransportDescriptionReferenceUpdated
clearcase 371 TCP, UDP Clearcase - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 371, and is it reachable?

Linux

sudo ss -ltnup 'sport = :371'      # process listening on 371
sudo lsof -nP -i :371

macOS

sudo lsof -nP -i :371

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 371 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 371
netstat -ano | findstr :371

From another machine

nmap -p 371 -sV <host>
sudo nmap -sU -p 371 <host>
nc -zv <host> 371

Block it in the firewall

sudo ufw deny 371/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 371" -Direction Inbound -LocalPort 371 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 371 used for?

Port 371 is assigned by IANA to clearcase (Clearcase).

Is port 371 TCP or UDP?

Port 371 is registered for TCP and UDP.

Is it safe to open port 371?

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 371 is open?

On Linux run "ss -ltnup 'sport = :371'", on macOS "lsof -nP -i :371", and on Windows "netstat -ano | findstr :371" to see the local process. From another machine, "nmap -p 371 <host>" shows whether it is reachable.

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