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// Other services

Port 1745: remote-winsock

Port 1745 is assigned by IANA to remote-winsock (remote-winsock).

1745

How remote-winsock works

Other services
client:1745remote-winsockresponse client:1745remote-winsockresponse

The client sends a request to port 1745 and the remote-winsock service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1745 dangerous?

We have no specific security note for port 1745. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1745

ServicePortTransportDescriptionReferenceUpdated
remote-winsock 1745 TCP, UDP remote-winsock - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1745, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1745'      # process listening on 1745
sudo lsof -nP -i :1745

macOS

sudo lsof -nP -i :1745

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1745 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1745
netstat -ano | findstr :1745

From another machine

nmap -p 1745 -sV <host>
sudo nmap -sU -p 1745 <host>
nc -zv <host> 1745

Block it in the firewall

sudo ufw deny 1745/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1745" -Direction Inbound -LocalPort 1745 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1745 used for?

Port 1745 is assigned by IANA to remote-winsock (remote-winsock).

Is port 1745 TCP or UDP?

Port 1745 is registered for TCP and UDP.

Is it safe to open port 1745?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1745 is open?

On Linux run "ss -ltnup 'sport = :1745'", on macOS "lsof -nP -i :1745", and on Windows "netstat -ano | findstr :1745" to see the local process. From another machine, "nmap -p 1745 <host>" shows whether it is reachable.

05 Related
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