HTTPfy

Port 3378 (wsicopy)

IANA assigns port 3378 to wsicopy: WSICOPY.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wsicopy TCP WSICOPY James Overby -
wsicopy UDP WSICOPY James Overby -

Check what is listening on port 3378

Linux: is anything listening on TCP 3378?
sudo ss -tlnp 'sport = :3378'
Linux: UDP 3378
sudo ss -ulnp 'sport = :3378'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3378
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3378 '
Windows (Command Prompt)
netstat -ano | findstr :3378
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3378 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3378
From Windows
Test-NetConnection HOST -Port 3378
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3378

Block port 3378 in the firewall

ufw
sudo ufw deny 3378/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3378 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3378 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3378' -Direction Inbound -Protocol TCP -LocalPort 3378 -Action Block
ufw
sudo ufw deny 3378/udp
iptables
sudo iptables -A INPUT -p udp --dport 3378 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3378 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3378' -Direction Inbound -Protocol UDP -LocalPort 3378 -Action Block

Related ports

3376cdbroker3377cogsys-lm3379socorfs3380sns-channels

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