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Port 3496 (seclayer-tls)

IANA assigns port 3496 to seclayer-tls: securitylayer over tls.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
seclayer-tls TCP securitylayer over tls Arno Hollosi -
seclayer-tls UDP securitylayer over tls Arno Hollosi -

Registry dates for this port: registered 2002-03.

Check what is listening on port 3496

Linux: is anything listening on TCP 3496?
sudo ss -tlnp 'sport = :3496'
Linux: UDP 3496
sudo ss -ulnp 'sport = :3496'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3496
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3496 '
Windows (Command Prompt)
netstat -ano | findstr :3496
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3496 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3496
From Windows
Test-NetConnection HOST -Port 3496
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3496

Block port 3496 in the firewall

ufw
sudo ufw deny 3496/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3496 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3496 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3496' -Direction Inbound -Protocol TCP -LocalPort 3496 -Action Block
ufw
sudo ufw deny 3496/udp
iptables
sudo iptables -A INPUT -p udp --dport 3496 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3496 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3496' -Direction Inbound -Protocol UDP -LocalPort 3496 -Action Block

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