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// Network services

Port 2374: Hydra RPC

Port 2374 is assigned by IANA to hydra (Hydra RPC).

2374

How hydra works

Network services
client:2374hydraresponse client:2374hydraresponse

The client sends a request to port 2374 and the hydra 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
Network services
01 Security

Is port 2374 dangerous?

We have no specific security note for port 2374. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 2374

ServicePortTransportDescriptionReferenceUpdated
hydra 2374 TCP Hydra RPC - 2009-01-21
-2374-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 2374, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2374'      # process listening on 2374
sudo lsof -nP -i :2374

macOS

sudo lsof -nP -i :2374

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2374 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2374
netstat -ano | findstr :2374

From another machine

nmap -p 2374 -sV <host>
nc -zv <host> 2374

Block it in the firewall

sudo ufw deny 2374/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2374" -Direction Inbound -LocalPort 2374 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2374 used for?

Port 2374 is assigned by IANA to hydra (Hydra RPC).

Is port 2374 TCP or UDP?

Port 2374 is registered for TCP.

Is it safe to open port 2374?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 2374 is open?

On Linux run "ss -ltnup 'sport = :2374'", on macOS "lsof -nP -i :2374", and on Windows "netstat -ano | findstr :2374" to see the local process. From another machine, "nmap -p 2374 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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