HTTPfy

Port 2811 (gsiftp)

IANA assigns port 2811 to gsiftp: GSI FTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gsiftp TCP GSI FTP Von Welch -
gsiftp UDP GSI FTP Von Welch -

Check what is listening on port 2811

Linux: is anything listening on TCP 2811?
sudo ss -tlnp 'sport = :2811'
Linux: UDP 2811
sudo ss -ulnp 'sport = :2811'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2811
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2811 '
Windows (Command Prompt)
netstat -ano | findstr :2811
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2811 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2811
From Windows
Test-NetConnection HOST -Port 2811
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2811

Block port 2811 in the firewall

ufw
sudo ufw deny 2811/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2811 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2811 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2811' -Direction Inbound -Protocol TCP -LocalPort 2811 -Action Block
ufw
sudo ufw deny 2811/udp
iptables
sudo iptables -A INPUT -p udp --dport 2811 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2811 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2811' -Direction Inbound -Protocol UDP -LocalPort 2811 -Action Block

Related ports

2809corbaloc2810netsteward2812atmtcp2813llm-pass

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