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// Other services

Port 1306: RE-Conn-Proto

Port 1306 is assigned by IANA to re-conn-proto (RE-Conn-Proto).

1306

How re-conn-proto works

Other services
client:1306re-conn-protoresponse client:1306re-conn-protoresponse

The client sends a request to port 1306 and the re-conn-proto 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 1306 dangerous?

We have no specific security note for port 1306. 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 1306

ServicePortTransportDescriptionReferenceUpdated
re-conn-proto 1306 TCP, UDP RE-Conn-Proto - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1306, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1306'      # process listening on 1306
sudo lsof -nP -i :1306

macOS

sudo lsof -nP -i :1306

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1306 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1306
netstat -ano | findstr :1306

From another machine

nmap -p 1306 -sV <host>
sudo nmap -sU -p 1306 <host>
nc -zv <host> 1306

Block it in the firewall

sudo ufw deny 1306/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1306" -Direction Inbound -LocalPort 1306 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1306 used for?

Port 1306 is assigned by IANA to re-conn-proto (RE-Conn-Proto).

Is port 1306 TCP or UDP?

Port 1306 is registered for TCP and UDP.

Is it safe to open port 1306?

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 1306 is open?

On Linux run "ss -ltnup 'sport = :1306'", on macOS "lsof -nP -i :1306", and on Windows "netstat -ano | findstr :1306" to see the local process. From another machine, "nmap -p 1306 <host>" shows whether it is reachable.

05 Related
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