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Port 10055 (qptlmd)

IANA assigns port 10055 to qptlmd: Quantapoint FLEXlm Licensing Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qptlmd TCP Quantapoint FLEXlm Licensing Service Justin Vegso -

Registry dates for this port: registered 2010-07-01.

Check what is listening on port 10055

Linux: is anything listening on TCP 10055?
sudo ss -tlnp 'sport = :10055'
Linux / macOS: which process owns the port
sudo lsof -nP -i :10055
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':10055 '
Windows (Command Prompt)
netstat -ano | findstr :10055
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 10055 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 10055
From Windows
Test-NetConnection HOST -Port 10055

Block port 10055 in the firewall

ufw
sudo ufw deny 10055/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 10055 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 10055 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 10055' -Direction Inbound -Protocol TCP -LocalPort 10055 -Action Block

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