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Port 1204 (ssslog-mgr)

IANA assigns port 1204 to ssslog-mgr: Log Request Listener.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ssslog-mgr TCP Log Request Listener Eric Bruno -
ssslog-mgr UDP Log Request Listener Eric Bruno -

Check what is listening on port 1204

Linux: is anything listening on TCP 1204?
sudo ss -tlnp 'sport = :1204'
Linux: UDP 1204
sudo ss -ulnp 'sport = :1204'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1204
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1204 '
Windows (Command Prompt)
netstat -ano | findstr :1204
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1204 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1204
From Windows
Test-NetConnection HOST -Port 1204
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1204

Block port 1204 in the firewall

ufw
sudo ufw deny 1204/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1204 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1204 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1204' -Direction Inbound -Protocol TCP -LocalPort 1204 -Action Block
ufw
sudo ufw deny 1204/udp
iptables
sudo iptables -A INPUT -p udp --dport 1204 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1204 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1204' -Direction Inbound -Protocol UDP -LocalPort 1204 -Action Block

Related ports

1202caiccipc1203ssslic-mgr1205accord-mgc1206anthony-data

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