HTTPfy

Port 2688 (md-cg-http)

IANA assigns port 2688 to md-cg-http: md-cf-http.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
md-cg-http TCP md-cf-http Lyndon Nerenberg -
md-cg-http UDP md-cf-http Lyndon Nerenberg -

Check what is listening on port 2688

Linux: is anything listening on TCP 2688?
sudo ss -tlnp 'sport = :2688'
Linux: UDP 2688
sudo ss -ulnp 'sport = :2688'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2688
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2688 '
Windows (Command Prompt)
netstat -ano | findstr :2688
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2688 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2688
From Windows
Test-NetConnection HOST -Port 2688
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2688

Block port 2688 in the firewall

ufw
sudo ufw deny 2688/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2688 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2688 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2688' -Direction Inbound -Protocol TCP -LocalPort 2688 -Action Block
ufw
sudo ufw deny 2688/udp
iptables
sudo iptables -A INPUT -p udp --dport 2688 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2688 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2688' -Direction Inbound -Protocol UDP -LocalPort 2688 -Action Block

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