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Port 3407 (ldap-admin)

IANA assigns port 3407 to ldap-admin: LDAP admin server port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ldap-admin TCP LDAP admin server port Stephen Tsun 2 -
ldap-admin UDP LDAP admin server port Stephen Tsun 2 -

Registry dates for this port: registered 2002-02.

Check what is listening on port 3407

Linux: is anything listening on TCP 3407?
sudo ss -tlnp 'sport = :3407'
Linux: UDP 3407
sudo ss -ulnp 'sport = :3407'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3407
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3407 '
Windows (Command Prompt)
netstat -ano | findstr :3407
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3407 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3407
From Windows
Test-NetConnection HOST -Port 3407
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3407

Block port 3407 in the firewall

ufw
sudo ufw deny 3407/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3407 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3407 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3407' -Direction Inbound -Protocol TCP -LocalPort 3407 -Action Block
ufw
sudo ufw deny 3407/udp
iptables
sudo iptables -A INPUT -p udp --dport 3407 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3407 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3407' -Direction Inbound -Protocol UDP -LocalPort 3407 -Action Block

Related ports

3405nokia-ann-ch13406nokia-ann-ch23408BESApi3409networklens

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