HTTPfy

Port 3805 (tcpdataserver)

IANA assigns port 3805 to tcpdataserver: ThorGuard Server Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tcpdataserver TCP ThorGuard Server Port Joel E Steiger -
tcpdataserver UDP ThorGuard Server Port Joel E Steiger -

Registry dates for this port: registered 2004-02.

Check what is listening on port 3805

Linux: is anything listening on TCP 3805?
sudo ss -tlnp 'sport = :3805'
Linux: UDP 3805
sudo ss -ulnp 'sport = :3805'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3805
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3805 '
Windows (Command Prompt)
netstat -ano | findstr :3805
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3805 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3805
From Windows
Test-NetConnection HOST -Port 3805
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3805

Block port 3805 in the firewall

ufw
sudo ufw deny 3805/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3805 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3805 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3805' -Direction Inbound -Protocol TCP -LocalPort 3805 -Action Block
ufw
sudo ufw deny 3805/udp
iptables
sudo iptables -A INPUT -p udp --dport 3805 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3805 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3805' -Direction Inbound -Protocol UDP -LocalPort 3805 -Action Block

Related ports

3803soniqsync3804iqnet-port3806wsmlb3807spugna

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