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Port 3406 (nokia-ann-ch2)

IANA assigns port 3406 to nokia-ann-ch2: Nokia Announcement ch 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nokia-ann-ch2 TCP Nokia Announcement ch 2 Morteza Kalhour -
nokia-ann-ch2 UDP Nokia Announcement ch 2 Morteza Kalhour -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3406

Linux: is anything listening on TCP 3406?
sudo ss -tlnp 'sport = :3406'
Linux: UDP 3406
sudo ss -ulnp 'sport = :3406'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3406
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3406 '
Windows (Command Prompt)
netstat -ano | findstr :3406
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3406 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3406
From Windows
Test-NetConnection HOST -Port 3406
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3406

Block port 3406 in the firewall

ufw
sudo ufw deny 3406/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3406 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3406 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3406' -Direction Inbound -Protocol TCP -LocalPort 3406 -Action Block
ufw
sudo ufw deny 3406/udp
iptables
sudo iptables -A INPUT -p udp --dport 3406 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3406 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3406' -Direction Inbound -Protocol UDP -LocalPort 3406 -Action Block

Related ports

3402fxaengine-net3405nokia-ann-ch13407ldap-admin3408BESApi

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.