HTTPfy

Port 4867 (unify-debug)

IANA assigns port 4867 to unify-debug: Unify Debugger.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
unify-debug TCP Unify Debugger Daegis Inc -
unify-debug UDP Unify Debugger Daegis Inc -

Registry dates for this port: registered 2006-05, last modified 2012-07-31.

Check what is listening on port 4867

Linux: is anything listening on TCP 4867?
sudo ss -tlnp 'sport = :4867'
Linux: UDP 4867
sudo ss -ulnp 'sport = :4867'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4867
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4867 '
Windows (Command Prompt)
netstat -ano | findstr :4867
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4867 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4867
From Windows
Test-NetConnection HOST -Port 4867
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4867

Block port 4867 in the firewall

ufw
sudo ufw deny 4867/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4867 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4867 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4867' -Direction Inbound -Protocol TCP -LocalPort 4867 -Action Block
ufw
sudo ufw deny 4867/udp
iptables
sudo iptables -A INPUT -p udp --dport 4867 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4867 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4867' -Direction Inbound -Protocol UDP -LocalPort 4867 -Action Block

Related ports

4850sun-as-nodeagt4851derby-repli4868phrelay4869phrelaydbg

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