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Port 4083 (lorica-out-sec)

IANA assigns port 4083 to lorica-out-sec: Lorica outside facing (SSL).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lorica-out-sec TCP Lorica outside facing (SSL) Johannes Skov Frands -
lorica-out-sec UDP Lorica outside facing (SSL) Johannes Skov Frands -

Registry dates for this port: registered 2008-02-28.

Check what is listening on port 4083

Linux: is anything listening on TCP 4083?
sudo ss -tlnp 'sport = :4083'
Linux: UDP 4083
sudo ss -ulnp 'sport = :4083'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4083
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4083 '
Windows (Command Prompt)
netstat -ano | findstr :4083
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4083
From Windows
Test-NetConnection HOST -Port 4083
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4083

Block port 4083 in the firewall

ufw
sudo ufw deny 4083/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4083 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4083' -Direction Inbound -Protocol TCP -LocalPort 4083 -Action Block
ufw
sudo ufw deny 4083/udp
iptables
sudo iptables -A INPUT -p udp --dport 4083 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4083' -Direction Inbound -Protocol UDP -LocalPort 4083 -Action Block

Related ports

4081lorica-in-sec4082lorica-out4084fortisphere-vm4085ezmessagesrv

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