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// Other services

Port 3682: EMC SmartPackets-MAPI

Port 3682 is assigned by IANA to cas-mapi (EMC SmartPackets-MAPI).

3682

How cas-mapi works

Other services
client:3682cas-mapiresponse client:3682cas-mapiresponse

The client sends a request to port 3682 and the cas-mapi 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 3682 dangerous?

We have no specific security note for port 3682. 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 3682

ServicePortTransportDescriptionReferenceUpdated
cas-mapi 3682 TCP, UDP EMC SmartPackets-MAPI - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3682, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3682'      # process listening on 3682
sudo lsof -nP -i :3682

macOS

sudo lsof -nP -i :3682

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3682 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3682
netstat -ano | findstr :3682

From another machine

nmap -p 3682 -sV <host>
sudo nmap -sU -p 3682 <host>
nc -zv <host> 3682

Block it in the firewall

sudo ufw deny 3682/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3682" -Direction Inbound -LocalPort 3682 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3682 used for?

Port 3682 is assigned by IANA to cas-mapi (EMC SmartPackets-MAPI).

Is port 3682 TCP or UDP?

Port 3682 is registered for TCP and UDP.

Is it safe to open port 3682?

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 3682 is open?

On Linux run "ss -ltnup 'sport = :3682'", on macOS "lsof -nP -i :3682", and on Windows "netstat -ano | findstr :3682" to see the local process. From another machine, "nmap -p 3682 <host>" shows whether it is reachable.

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