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Port 8686 (sun-as-jmxrmi)

IANA assigns port 8686 to sun-as-jmxrmi: Sun App Server - JMX/RMI.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sun-as-jmxrmi TCP Sun App Server - JMX/RMI Abhijit Kumar -
sun-as-jmxrmi UDP Sun App Server - JMX/RMI Abhijit Kumar -

Registry dates for this port: registered 2005-11.

Check what is listening on port 8686

Linux: is anything listening on TCP 8686?
sudo ss -tlnp 'sport = :8686'
Linux: UDP 8686
sudo ss -ulnp 'sport = :8686'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8686
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8686 '
Windows (Command Prompt)
netstat -ano | findstr :8686
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8686 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8686
From Windows
Test-NetConnection HOST -Port 8686
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8686

Block port 8686 in the firewall

ufw
sudo ufw deny 8686/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8686 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8686 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8686' -Direction Inbound -Protocol TCP -LocalPort 8686 -Action Block
ufw
sudo ufw deny 8686/udp
iptables
sudo iptables -A INPUT -p udp --dport 8686 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8686 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8686' -Direction Inbound -Protocol UDP -LocalPort 8686 -Action Block

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