Port 5543 (qftest-lic-mcp)

IANA assigns port 5543 to qftest-lic-mcp: QF-Test License Server / QF-Test MCP Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

qftest-lic-mcp TCP QF-Test License Server / QF-Test MCP Server Quality First Software GmbH -

Registry dates for this port: registered 2024-01-05, last modified 2026-09-04.

Linux: is anything listening on TCP 5543?

sudo ss -tlnp 'sport = :5543'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5543

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5543 '

Windows (Command Prompt)

netstat -ano | findstr :5543

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5543 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5543

From Windows

Test-NetConnection HOST -Port 5543

ufw

sudo ufw deny 5543/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5543 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5543 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5543' -Direction Inbound -Protocol TCP -LocalPort 5543 -Action Block

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