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// Other services

Port 2803: btprjctrl

Port 2803 is assigned by IANA to btprjctrl (btprjctrl).

2803

How btprjctrl works

Other services
client:2803btprjctrlresponse client:2803btprjctrlresponse

The client sends a request to port 2803 and the btprjctrl 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 2803 dangerous?

We have no specific security note for port 2803. 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 2803

ServicePortTransportDescriptionReferenceUpdated
btprjctrl 2803 TCP, UDP btprjctrl - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2803, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2803'      # process listening on 2803
sudo lsof -nP -i :2803

macOS

sudo lsof -nP -i :2803

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2803 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2803
netstat -ano | findstr :2803

From another machine

nmap -p 2803 -sV <host>
sudo nmap -sU -p 2803 <host>
nc -zv <host> 2803

Block it in the firewall

sudo ufw deny 2803/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2803" -Direction Inbound -LocalPort 2803 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2803 used for?

Port 2803 is assigned by IANA to btprjctrl (btprjctrl).

Is port 2803 TCP or UDP?

Port 2803 is registered for TCP and UDP.

Is it safe to open port 2803?

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 2803 is open?

On Linux run "ss -ltnup 'sport = :2803'", on macOS "lsof -nP -i :2803", and on Windows "netstat -ano | findstr :2803" to see the local process. From another machine, "nmap -p 2803 <host>" shows whether it is reachable.

05 Related
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