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Port 1203 (ssslic-mgr)

IANA assigns port 1203 to ssslic-mgr: License Validation.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ssslic-mgr TCP License Validation - -
ssslic-mgr UDP License Validation - -

Check what is listening on port 1203

Linux: is anything listening on TCP 1203?
sudo ss -tlnp 'sport = :1203'
Linux: UDP 1203
sudo ss -ulnp 'sport = :1203'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1203
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1203 '
Windows (Command Prompt)
netstat -ano | findstr :1203
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1203 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1203
From Windows
Test-NetConnection HOST -Port 1203
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1203

Block port 1203 in the firewall

ufw
sudo ufw deny 1203/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1203 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1203' -Direction Inbound -Protocol TCP -LocalPort 1203 -Action Block
ufw
sudo ufw deny 1203/udp
iptables
sudo iptables -A INPUT -p udp --dport 1203 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1203' -Direction Inbound -Protocol UDP -LocalPort 1203 -Action Block

Related ports

1201nucleus-sand1202caiccipc1204ssslog-mgr1205accord-mgc

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.