Port 27019 (MongoDB config server)

Default port of mongod running with --configsvr in sharded clusters.

Registered (user) port, 1024-49151 TCP Databases Do not expose to the internet

What port 27019 is used for

Default port of mongod running with --configsvr in sharded clusters.

Do not expose to the internet. Same as 27017.

Port 27019 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Linux: is anything listening on TCP 27019?

sudo ss -tlnp 'sport = :27019'

Linux / macOS: which process owns the port

sudo lsof -nP -i :27019

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':27019 '

Windows (Command Prompt)

netstat -ano | findstr :27019

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 27019 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 27019

From Windows

Test-NetConnection HOST -Port 27019

ufw

sudo ufw deny 27019/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 27019 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 27019 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 27019' -Direction Inbound -Protocol TCP -LocalPort 27019 -Action Block

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