Port 6600 (mshvlm)

IANA assigns port 6600 to mshvlm: Microsoft Hyper-V Live Migration.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

mshvlm TCP Microsoft Hyper-V Live Migration Rajesh D -

Registry dates for this port: registered 2009-02-03.

Linux: is anything listening on TCP 6600?

sudo ss -tlnp 'sport = :6600'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6600

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6600 '

Windows (Command Prompt)

netstat -ano | findstr :6600

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6600 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 6600

From Windows

Test-NetConnection HOST -Port 6600

ufw

sudo ufw deny 6600/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6600 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6600 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6600' -Direction Inbound -Protocol TCP -LocalPort 6600 -Action Block

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