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// Other services

Port 5045: Open Settlement Protocol

Port 5045 is assigned by IANA to osp (Open Settlement Protocol).

5045

How osp works

Other services
client:5045ospresponse client:5045ospresponse

The client sends a request to port 5045 and the osp 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
Other services
01 Security

Is port 5045 dangerous?

We have no specific security note for port 5045. 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 5045

ServicePortTransportDescriptionReferenceUpdated
osp 5045 TCP Open Settlement Protocol - 2010-03-05
-5045-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5045, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5045'      # process listening on 5045
sudo lsof -nP -i :5045

macOS

sudo lsof -nP -i :5045

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5045 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5045
netstat -ano | findstr :5045

From another machine

nmap -p 5045 -sV <host>
nc -zv <host> 5045

Block it in the firewall

sudo ufw deny 5045/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5045" -Direction Inbound -LocalPort 5045 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5045 used for?

Port 5045 is assigned by IANA to osp (Open Settlement Protocol).

Is port 5045 TCP or UDP?

Port 5045 is registered for TCP.

Is it safe to open port 5045?

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 5045 is open?

On Linux run "ss -ltnup 'sport = :5045'", on macOS "lsof -nP -i :5045", and on Windows "netstat -ano | findstr :5045" to see the local process. From another machine, "nmap -p 5045 <host>" shows whether it is reachable.

05 Related
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