HTTPfy

Port 3568 (dof-tunnel-sec)

IANA assigns port 3568 to dof-tunnel-sec: DOF Secure Tunnel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dof-tunnel-sec TCP DOF Secure Tunnel OpenDOF -
dof-tunnel-sec UDP DOF Secure Tunnel OpenDOF -

Registry dates for this port: registered 2003-01, last modified 2015-04-23.

Check what is listening on port 3568

Linux: is anything listening on TCP 3568?
sudo ss -tlnp 'sport = :3568'
Linux: UDP 3568
sudo ss -ulnp 'sport = :3568'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3568
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3568 '
Windows (Command Prompt)
netstat -ano | findstr :3568
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3568 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3568
From Windows
Test-NetConnection HOST -Port 3568
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3568

Block port 3568 in the firewall

ufw
sudo ufw deny 3568/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3568 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3568 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3568' -Direction Inbound -Protocol TCP -LocalPort 3568 -Action Block
ufw
sudo ufw deny 3568/udp
iptables
sudo iptables -A INPUT -p udp --dport 3568 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3568 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3568' -Direction Inbound -Protocol UDP -LocalPort 3568 -Action Block

Related ports

3566quest-data-hub3567dof-eps3569mbg-ctrl3570mccwebsvr-port

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