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Port 1104 (xrl)

IANA assigns port 1104 to xrl: XRL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xrl TCP XRL Patrick Robinson -
xrl UDP XRL Patrick Robinson -

Check what is listening on port 1104

Linux: is anything listening on TCP 1104?
sudo ss -tlnp 'sport = :1104'
Linux: UDP 1104
sudo ss -ulnp 'sport = :1104'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1104
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1104 '
Windows (Command Prompt)
netstat -ano | findstr :1104
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1104 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1104
From Windows
Test-NetConnection HOST -Port 1104
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1104

Block port 1104 in the firewall

ufw
sudo ufw deny 1104/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1104 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1104 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1104' -Direction Inbound -Protocol TCP -LocalPort 1104 -Action Block
ufw
sudo ufw deny 1104/udp
iptables
sudo iptables -A INPUT -p udp --dport 1104 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1104 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1104' -Direction Inbound -Protocol UDP -LocalPort 1104 -Action Block

Related ports

1102adobeserver-11103adobeserver-21105ftranhc1106isoipsigport-1

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