CyberHunter
Local dataset, no network
// Other services

Port 3688: simple-push Secure

Port 3688 is assigned by IANA to simple-push-s (simple-push Secure).

3688

How simple-push-s works

Other services
client:3688simple-push-sresponse client:3688simple-push-sresponse

The client sends a request to port 3688 and the simple-push-s 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 3688 dangerous?

We have no specific security note for port 3688. 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 3688

ServicePortTransportDescriptionReferenceUpdated
simple-push-s 3688 TCP, UDP simple-push Secure - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3688, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3688'      # process listening on 3688
sudo lsof -nP -i :3688

macOS

sudo lsof -nP -i :3688

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3688 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3688
netstat -ano | findstr :3688

From another machine

nmap -p 3688 -sV <host>
sudo nmap -sU -p 3688 <host>
nc -zv <host> 3688

Block it in the firewall

sudo ufw deny 3688/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3688" -Direction Inbound -LocalPort 3688 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3688 used for?

Port 3688 is assigned by IANA to simple-push-s (simple-push Secure).

Is port 3688 TCP or UDP?

Port 3688 is registered for TCP and UDP.

Is it safe to open port 3688?

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 3688 is open?

On Linux run "ss -ltnup 'sport = :3688'", on macOS "lsof -nP -i :3688", and on Windows "netstat -ano | findstr :3688" to see the local process. From another machine, "nmap -p 3688 <host>" shows whether it is reachable.

05 Related
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