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// Other services

Port 1203: License Validation

Port 1203 is assigned by IANA to ssslic-mgr (License Validation).

1203

How ssslic-mgr works

Other services
client:1203ssslic-mgrresponse client:1203ssslic-mgrresponse

The client sends a request to port 1203 and the ssslic-mgr 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 1203 dangerous?

We have no specific security note for port 1203. 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 1203

ServicePortTransportDescriptionReferenceUpdated
ssslic-mgr 1203 TCP, UDP License Validation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1203, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1203'      # process listening on 1203
sudo lsof -nP -i :1203

macOS

sudo lsof -nP -i :1203

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1203 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1203
netstat -ano | findstr :1203

From another machine

nmap -p 1203 -sV <host>
sudo nmap -sU -p 1203 <host>
nc -zv <host> 1203

Block it in the firewall

sudo ufw deny 1203/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1203" -Direction Inbound -LocalPort 1203 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1203 used for?

Port 1203 is assigned by IANA to ssslic-mgr (License Validation).

Is port 1203 TCP or UDP?

Port 1203 is registered for TCP and UDP.

Is it safe to open port 1203?

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 1203 is open?

On Linux run "ss -ltnup 'sport = :1203'", on macOS "lsof -nP -i :1203", and on Windows "netstat -ano | findstr :1203" to see the local process. From another machine, "nmap -p 1203 <host>" shows whether it is reachable.

05 Related
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