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// Other services

Port 7501: HP OpenView Bus Daemon

Port 7501 is assigned by IANA to ovbus (HP OpenView Bus Daemon).

7501

How ovbus works

Other services
client:7501ovbusresponse client:7501ovbusresponse

The client sends a request to port 7501 and the ovbus 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 7501 dangerous?

We have no specific security note for port 7501. 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 7501

ServicePortTransportDescriptionReferenceUpdated
ovbus 7501 TCP, UDP HP OpenView Bus Daemon
Reported: Known Unauthorized Use on port 7501
 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7501, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7501'      # process listening on 7501
sudo lsof -nP -i :7501

macOS

sudo lsof -nP -i :7501

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7501 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7501
netstat -ano | findstr :7501

From another machine

nmap -p 7501 -sV <host>
sudo nmap -sU -p 7501 <host>
nc -zv <host> 7501

Block it in the firewall

sudo ufw deny 7501/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7501" -Direction Inbound -LocalPort 7501 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7501 used for?

Port 7501 is assigned by IANA to ovbus (HP OpenView Bus Daemon).

Is port 7501 TCP or UDP?

Port 7501 is registered for TCP and UDP.

Is it safe to open port 7501?

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 7501 is open?

On Linux run "ss -ltnup 'sport = :7501'", on macOS "lsof -nP -i :7501", and on Windows "netstat -ano | findstr :7501" to see the local process. From another machine, "nmap -p 7501 <host>" shows whether it is reachable.

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