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Port 6655 (pcs-sf-ui-man)

IANA assigns port 6655 to pcs-sf-ui-man: PC SOFT - Software factory UI/manager.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pcs-sf-ui-man TCP PC SOFT - Software factory UI/manager Jerome AERTS -

Registry dates for this port: registered 2010-11-30.

Check what is listening on port 6655

Linux: is anything listening on TCP 6655?
sudo ss -tlnp 'sport = :6655'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6655
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6655 '
Windows (Command Prompt)
netstat -ano | findstr :6655
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6655 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6655
From Windows
Test-NetConnection HOST -Port 6655

Block port 6655 in the firewall

ufw
sudo ufw deny 6655/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6655 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6655 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6655' -Direction Inbound -Protocol TCP -LocalPort 6655 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.