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Port 1090 (ff-fms)

IANA assigns port 1090 to ff-fms: FF Fieldbus Message Specification.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ff-fms TCP FF Fieldbus Message Specification - -
ff-fms UDP FF Fieldbus Message Specification - -

Check what is listening on port 1090

Linux: is anything listening on TCP 1090?
sudo ss -tlnp 'sport = :1090'
Linux: UDP 1090
sudo ss -ulnp 'sport = :1090'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1090
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1090 '
Windows (Command Prompt)
netstat -ano | findstr :1090
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1090 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1090
From Windows
Test-NetConnection HOST -Port 1090
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1090

Block port 1090 in the firewall

ufw
sudo ufw deny 1090/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1090 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1090 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1090' -Direction Inbound -Protocol TCP -LocalPort 1090 -Action Block
ufw
sudo ufw deny 1090/udp
iptables
sudo iptables -A INPUT -p udp --dport 1090 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1090 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1090' -Direction Inbound -Protocol UDP -LocalPort 1090 -Action Block

Related ports

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