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Port 144 (uma)

IANA assigns port 144 to uma: Universal Management Architecture.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
uma TCP Universal Management Architecture Jay Whitney -
uma UDP Universal Management Architecture Jay Whitney -

Check what is listening on port 144

Linux: is anything listening on TCP 144?
sudo ss -tlnp 'sport = :144'
Linux: UDP 144
sudo ss -ulnp 'sport = :144'
Linux / macOS: which process owns the port
sudo lsof -nP -i :144
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':144 '
Windows (Command Prompt)
netstat -ano | findstr :144
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 144 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 144
From Windows
Test-NetConnection HOST -Port 144
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 144

Block port 144 in the firewall

ufw
sudo ufw deny 144/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 144 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 144 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 144' -Direction Inbound -Protocol TCP -LocalPort 144 -Action Block
ufw
sudo ufw deny 144/udp
iptables
sudo iptables -A INPUT -p udp --dport 144 -j DROP
nftables
sudo nft add rule inet filter input udp dport 144 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 144' -Direction Inbound -Protocol UDP -LocalPort 144 -Action Block

Related ports

1797uma142bl-idm143IMAP145uaac146iso-tp0

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