HTTPfy

Port 3365 (contentserver)

IANA assigns port 3365 to contentserver: Content Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
contentserver TCP Content Server - -
contentserver UDP Content Server - -

Check what is listening on port 3365

Linux: is anything listening on TCP 3365?
sudo ss -tlnp 'sport = :3365'
Linux: UDP 3365
sudo ss -ulnp 'sport = :3365'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3365
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3365 '
Windows (Command Prompt)
netstat -ano | findstr :3365
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3365 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3365
From Windows
Test-NetConnection HOST -Port 3365
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3365

Block port 3365 in the firewall

ufw
sudo ufw deny 3365/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3365 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3365 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3365' -Direction Inbound -Protocol TCP -LocalPort 3365 -Action Block
ufw
sudo ufw deny 3365/udp
iptables
sudo iptables -A INPUT -p udp --dport 3365 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3365 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3365' -Direction Inbound -Protocol UDP -LocalPort 3365 -Action Block

Related ports

454contentserver3363nati-vi-server3364creativeserver3366creativepartnr3372tip2

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