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Port 141 (emfis-cntl)

IANA assigns port 141 to emfis-cntl: EMFIS Control Service.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
emfis-cntl TCP EMFIS Control Service Gerd Beling -
emfis-cntl UDP EMFIS Control Service Gerd Beling -

Check what is listening on port 141

Linux: is anything listening on TCP 141?
sudo ss -tlnp 'sport = :141'
Linux: UDP 141
sudo ss -ulnp 'sport = :141'
Linux / macOS: which process owns the port
sudo lsof -nP -i :141
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':141 '
Windows (Command Prompt)
netstat -ano | findstr :141
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 141 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 141
From Windows
Test-NetConnection HOST -Port 141
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 141

Block port 141 in the firewall

ufw
sudo ufw deny 141/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 141 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 141 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 141' -Direction Inbound -Protocol TCP -LocalPort 141 -Action Block
ufw
sudo ufw deny 141/udp
iptables
sudo iptables -A INPUT -p udp --dport 141 -j DROP
nftables
sudo nft add rule inet filter input udp dport 141 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 141' -Direction Inbound -Protocol UDP -LocalPort 141 -Action Block

Related ports

139NetBIOS Session Service140emfis-data142bl-idm143IMAP

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