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// Other services

Port 3220: XML NM over SSL

Port 3220 is assigned by IANA to xnm-ssl (XML NM over SSL).

3220

How xnm-ssl works

Other services
client:3220#%&@!x9response? client:3220#%&@!x9response?

The client sends a request to port 3220 and the xnm-ssl service answers. 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
Other services
01 Security

Is port 3220 dangerous?

We have no specific security note for port 3220. 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 3220

ServicePortTransportDescriptionReferenceUpdated
xnm-ssl 3220 TCP, UDP XML NM over SSL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3220, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3220'      # process listening on 3220
sudo lsof -nP -i :3220

macOS

sudo lsof -nP -i :3220

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3220 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3220
netstat -ano | findstr :3220

From another machine

nmap -p 3220 -sV <host>
sudo nmap -sU -p 3220 <host>
nc -zv <host> 3220

Block it in the firewall

sudo ufw deny 3220/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3220" -Direction Inbound -LocalPort 3220 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3220 used for?

Port 3220 is assigned by IANA to xnm-ssl (XML NM over SSL).

Is port 3220 TCP or UDP?

Port 3220 is registered for TCP and UDP.

Is it safe to open port 3220?

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 3220 is open?

On Linux run "ss -ltnup 'sport = :3220'", on macOS "lsof -nP -i :3220", and on Windows "netstat -ano | findstr :3220" to see the local process. From another machine, "nmap -p 3220 <host>" shows whether it is reachable.

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