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Port 140 (emfis-data)

IANA assigns port 140 to emfis-data: EMFIS Data Service.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
emfis-data TCP EMFIS Data Service - -
emfis-data UDP EMFIS Data Service - -

Check what is listening on port 140

Linux: is anything listening on TCP 140?
sudo ss -tlnp 'sport = :140'
Linux: UDP 140
sudo ss -ulnp 'sport = :140'
Linux / macOS: which process owns the port
sudo lsof -nP -i :140
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':140 '
Windows (Command Prompt)
netstat -ano | findstr :140
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 140 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 140
From Windows
Test-NetConnection HOST -Port 140
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 140

Block port 140 in the firewall

ufw
sudo ufw deny 140/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 140 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 140 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 140' -Direction Inbound -Protocol TCP -LocalPort 140 -Action Block
ufw
sudo ufw deny 140/udp
iptables
sudo iptables -A INPUT -p udp --dport 140 -j DROP
nftables
sudo nft add rule inet filter input udp dport 140 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 140' -Direction Inbound -Protocol UDP -LocalPort 140 -Action Block

Related ports

138NetBIOS Datagram Service139NetBIOS Session Service141emfis-cntl142bl-idm

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