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// Other services

Port 3563: Watcom Debug

Port 3563 is assigned by IANA to watcomdebug (Watcom Debug).

3563

How watcomdebug works

Other services
client:3563watcomdebugresponse client:3563watcomdebugresponse

The client sends a request to port 3563 and the watcomdebug 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 3563 dangerous?

We have no specific security note for port 3563. 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 3563

ServicePortTransportDescriptionReferenceUpdated
watcomdebug 3563 TCP, UDP Watcom Debug - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3563, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3563'      # process listening on 3563
sudo lsof -nP -i :3563

macOS

sudo lsof -nP -i :3563

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3563 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3563
netstat -ano | findstr :3563

From another machine

nmap -p 3563 -sV <host>
sudo nmap -sU -p 3563 <host>
nc -zv <host> 3563

Block it in the firewall

sudo ufw deny 3563/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3563" -Direction Inbound -LocalPort 3563 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3563 used for?

Port 3563 is assigned by IANA to watcomdebug (Watcom Debug).

Is port 3563 TCP or UDP?

Port 3563 is registered for TCP and UDP.

Is it safe to open port 3563?

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 3563 is open?

On Linux run "ss -ltnup 'sport = :3563'", on macOS "lsof -nP -i :3563", and on Windows "netstat -ano | findstr :3563" to see the local process. From another machine, "nmap -p 3563 <host>" shows whether it is reachable.

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