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// Other services

Port 3635: Simple Distributed Objects

Port 3635 is assigned by IANA to sdo (Simple Distributed Objects).

3635

How sdo works

Other services
client:3635sdoresponse client:3635sdoresponse

The client sends a request to port 3635 and the sdo 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 3635 dangerous?

We have no specific security note for port 3635. 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 3635

ServicePortTransportDescriptionReferenceUpdated
sdo 3635 TCP, UDP Simple Distributed Objects - 2002-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3635, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3635'      # process listening on 3635
sudo lsof -nP -i :3635

macOS

sudo lsof -nP -i :3635

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3635 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3635
netstat -ano | findstr :3635

From another machine

nmap -p 3635 -sV <host>
sudo nmap -sU -p 3635 <host>
nc -zv <host> 3635

Block it in the firewall

sudo ufw deny 3635/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3635" -Direction Inbound -LocalPort 3635 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3635 used for?

Port 3635 is assigned by IANA to sdo (Simple Distributed Objects).

Is port 3635 TCP or UDP?

Port 3635 is registered for TCP and UDP.

Is it safe to open port 3635?

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 3635 is open?

On Linux run "ss -ltnup 'sport = :3635'", on macOS "lsof -nP -i :3635", and on Windows "netstat -ano | findstr :3635" to see the local process. From another machine, "nmap -p 3635 <host>" shows whether it is reachable.

05 Related
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