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Port 5745 (fcopy-server)

IANA assigns port 5745 to fcopy-server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fcopy-server TCP fcopy-server Moshe Leibovitch -
fcopy-server UDP fcopy-server Moshe Leibovitch -

Check what is listening on port 5745

Linux: is anything listening on TCP 5745?
sudo ss -tlnp 'sport = :5745'
Linux: UDP 5745
sudo ss -ulnp 'sport = :5745'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5745
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5745 '
Windows (Command Prompt)
netstat -ano | findstr :5745
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5745 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5745
From Windows
Test-NetConnection HOST -Port 5745
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5745

Block port 5745 in the firewall

ufw
sudo ufw deny 5745/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5745 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5745 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5745' -Direction Inbound -Protocol TCP -LocalPort 5745 -Action Block
ufw
sudo ufw deny 5745/udp
iptables
sudo iptables -A INPUT -p udp --dport 5745 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5745 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5745' -Direction Inbound -Protocol UDP -LocalPort 5745 -Action Block

Related ports

5743watchdoc-pod5744watchdoc5746fcopys-server5747tunatic

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