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Port 8786 (msgclnt)

IANA assigns port 8786 to msgclnt: Message Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
msgclnt TCP Message Client Michael O Brien -
msgclnt UDP Message Client Michael O Brien -

Registry dates for this port: registered 2003-03.

Check what is listening on port 8786

Linux: is anything listening on TCP 8786?
sudo ss -tlnp 'sport = :8786'
Linux: UDP 8786
sudo ss -ulnp 'sport = :8786'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8786
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8786 '
Windows (Command Prompt)
netstat -ano | findstr :8786
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8786 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8786
From Windows
Test-NetConnection HOST -Port 8786
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8786

Block port 8786 in the firewall

ufw
sudo ufw deny 8786/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8786 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8786 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8786' -Direction Inbound -Protocol TCP -LocalPort 8786 -Action Block
ufw
sudo ufw deny 8786/udp
iptables
sudo iptables -A INPUT -p udp --dport 8786 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8786 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8786' -Direction Inbound -Protocol UDP -LocalPort 8786 -Action Block

Related ports

8770dpap8778uec8787msgsrvr8793acd-pm

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