HTTPfy

Port 3879 (appss-lm)

IANA assigns port 3879 to appss-lm: appss license manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
appss-lm TCP appss license manager Peter Krueger -
appss-lm UDP appss license manager Peter Krueger -

Registry dates for this port: registered 2003-10.

Check what is listening on port 3879

Linux: is anything listening on TCP 3879?
sudo ss -tlnp 'sport = :3879'
Linux: UDP 3879
sudo ss -ulnp 'sport = :3879'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3879
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3879 '
Windows (Command Prompt)
netstat -ano | findstr :3879
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3879 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3879
From Windows
Test-NetConnection HOST -Port 3879
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3879

Block port 3879 in the firewall

ufw
sudo ufw deny 3879/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3879 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3879 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3879' -Direction Inbound -Protocol TCP -LocalPort 3879 -Action Block
ufw
sudo ufw deny 3879/udp
iptables
sudo iptables -A INPUT -p udp --dport 3879 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3879 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3879' -Direction Inbound -Protocol UDP -LocalPort 3879 -Action Block

Related ports

3877xmpcr-interface3878fotogcad3880igrs3881idac

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