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// Other services

Port 1807: Fujitsu Hot Standby Protocol

Port 1807 is assigned by IANA to fhsp (Fujitsu Hot Standby Protocol).

1807

How fhsp works

Other services
client:1807fhspresponse client:1807fhspresponse

The client sends a request to port 1807 and the fhsp 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 1807 dangerous?

We have no specific security note for port 1807. 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 1807

ServicePortTransportDescriptionReferenceUpdated
fhsp 1807 TCP, UDP Fujitsu Hot Standby Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1807, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1807'      # process listening on 1807
sudo lsof -nP -i :1807

macOS

sudo lsof -nP -i :1807

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1807 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1807
netstat -ano | findstr :1807

From another machine

nmap -p 1807 -sV <host>
sudo nmap -sU -p 1807 <host>
nc -zv <host> 1807

Block it in the firewall

sudo ufw deny 1807/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1807" -Direction Inbound -LocalPort 1807 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1807 used for?

Port 1807 is assigned by IANA to fhsp (Fujitsu Hot Standby Protocol).

Is port 1807 TCP or UDP?

Port 1807 is registered for TCP and UDP.

Is it safe to open port 1807?

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 1807 is open?

On Linux run "ss -ltnup 'sport = :1807'", on macOS "lsof -nP -i :1807", and on Windows "netstat -ano | findstr :1807" to see the local process. From another machine, "nmap -p 1807 <host>" shows whether it is reachable.

05 Related
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