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// File transfer & sharing

Port 3713: TFTP over TLS

Port 3713 is assigned by IANA to tftps (TFTP over TLS).

3713

How tftps works

File transfer & sharing
client:37131/32/33/3tftps? client:37131/32/33/3tftps?

Files are sent over port 3713 in pieces and reassembled on the other side. Everything is encrypted: someone on the path only sees unreadable bytes.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
EncryptedTLS or built-in crypto
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
File transfer & sharing
01 Security

Is port 3713 dangerous?

We have no specific security note for port 3713. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 3713

ServicePortTransportDescriptionReferenceUpdated
tftps 3713 TCP, UDP TFTP over TLS - 2003-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 3713, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3713'      # process listening on 3713
sudo lsof -nP -i :3713

macOS

sudo lsof -nP -i :3713

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3713 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3713
netstat -ano | findstr :3713

From another machine

nmap -p 3713 -sV <host>
sudo nmap -sU -p 3713 <host>
nc -zv <host> 3713

Block it in the firewall

sudo ufw deny 3713/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3713" -Direction Inbound -LocalPort 3713 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3713 used for?

Port 3713 is assigned by IANA to tftps (TFTP over TLS).

Is port 3713 TCP or UDP?

Port 3713 is registered for TCP and UDP.

Is it safe to open port 3713?

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. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 3713 is open?

On Linux run "ss -ltnup 'sport = :3713'", on macOS "lsof -nP -i :3713", and on Windows "netstat -ano | findstr :3713" to see the local process. From another machine, "nmap -p 3713 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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