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Port 3312 (appman-server)

IANA assigns port 3312 to appman-server: Application Management Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
appman-server TCP Application Management Server - -
appman-server UDP Application Management Server - -

Check what is listening on port 3312

Linux: is anything listening on TCP 3312?
sudo ss -tlnp 'sport = :3312'
Linux: UDP 3312
sudo ss -ulnp 'sport = :3312'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3312
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3312 '
Windows (Command Prompt)
netstat -ano | findstr :3312
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3312 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3312
From Windows
Test-NetConnection HOST -Port 3312
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3312

Block port 3312 in the firewall

ufw
sudo ufw deny 3312/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3312 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3312 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3312' -Direction Inbound -Protocol TCP -LocalPort 3312 -Action Block
ufw
sudo ufw deny 3312/udp
iptables
sudo iptables -A INPUT -p udp --dport 3312 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3312 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3312' -Direction Inbound -Protocol UDP -LocalPort 3312 -Action Block

Related ports

3310dyna-access3311mcns-tel-ret3313uorb3314uohost

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