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Port 6143 (watershed-lm)

IANA assigns port 6143 to watershed-lm: Watershed License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
watershed-lm TCP Watershed License Manager David Ferrero -
watershed-lm UDP Watershed License Manager David Ferrero -

Check what is listening on port 6143

Linux: is anything listening on TCP 6143?
sudo ss -tlnp 'sport = :6143'
Linux: UDP 6143
sudo ss -ulnp 'sport = :6143'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6143
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6143 '
Windows (Command Prompt)
netstat -ano | findstr :6143
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6143 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6143
From Windows
Test-NetConnection HOST -Port 6143
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6143

Block port 6143 in the firewall

ufw
sudo ufw deny 6143/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6143 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6143 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6143' -Direction Inbound -Protocol TCP -LocalPort 6143 -Action Block
ufw
sudo ufw deny 6143/udp
iptables
sudo iptables -A INPUT -p udp --dport 6143 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6143 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6143' -Direction Inbound -Protocol UDP -LocalPort 6143 -Action Block

Related ports

6141meta-corp6142aspentec-lm6144statsci1-lm6145statsci2-lm

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