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Port 3308 (tns-server)

IANA assigns port 3308 to tns-server: TNS Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tns-server TCP TNS Server - -
tns-server UDP TNS Server - -

Check what is listening on port 3308

Linux: is anything listening on TCP 3308?
sudo ss -tlnp 'sport = :3308'
Linux: UDP 3308
sudo ss -ulnp 'sport = :3308'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3308
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3308 '
Windows (Command Prompt)
netstat -ano | findstr :3308
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3308 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3308
From Windows
Test-NetConnection HOST -Port 3308
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3308

Block port 3308 in the firewall

ufw
sudo ufw deny 3308/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3308 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3308 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3308' -Direction Inbound -Protocol TCP -LocalPort 3308 -Action Block
ufw
sudo ufw deny 3308/udp
iptables
sudo iptables -A INPUT -p udp --dport 3308 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3308 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3308' -Direction Inbound -Protocol UDP -LocalPort 3308 -Action Block

Related ports

3306MySQL / MariaDB3307opsession-prxy3309tns-adv3310dyna-access

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