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Port 1745 (remote-winsock)

IANA assigns port 1745 to remote-winsock.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
remote-winsock TCP remote-winsock Avi Nathan -
remote-winsock UDP remote-winsock Avi Nathan -

Check what is listening on port 1745

Linux: is anything listening on TCP 1745?
sudo ss -tlnp 'sport = :1745'
Linux: UDP 1745
sudo ss -ulnp 'sport = :1745'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1745
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1745 '
Windows (Command Prompt)
netstat -ano | findstr :1745
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1745 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1745
From Windows
Test-NetConnection HOST -Port 1745
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1745

Block port 1745 in the firewall

ufw
sudo ufw deny 1745/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1745 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1745 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1745' -Direction Inbound -Protocol TCP -LocalPort 1745 -Action Block
ufw
sudo ufw deny 1745/udp
iptables
sudo iptables -A INPUT -p udp --dport 1745 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1745 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1745' -Direction Inbound -Protocol UDP -LocalPort 1745 -Action Block

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