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Port 6786 (smc-jmx)

IANA assigns port 6786 to smc-jmx: Sun Java Web Console JMX.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
smc-jmx TCP Sun Java Web Console JMX Bill Edwards -
smc-jmx UDP Sun Java Web Console JMX Bill Edwards -

Registry dates for this port: registered 2005-08.

Check what is listening on port 6786

Linux: is anything listening on TCP 6786?
sudo ss -tlnp 'sport = :6786'
Linux: UDP 6786
sudo ss -ulnp 'sport = :6786'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6786
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6786 '
Windows (Command Prompt)
netstat -ano | findstr :6786
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6786 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6786
From Windows
Test-NetConnection HOST -Port 6786
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6786

Block port 6786 in the firewall

ufw
sudo ufw deny 6786/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6786 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6786 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6786' -Direction Inbound -Protocol TCP -LocalPort 6786 -Action Block
ufw
sudo ufw deny 6786/udp
iptables
sudo iptables -A INPUT -p udp --dport 6786 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6786 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6786' -Direction Inbound -Protocol UDP -LocalPort 6786 -Action Block

Related ports

6784bfd-lag6785dgpf-exchg6787smc-admin6788smc-http

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