- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 19220: Client Connection Management and Data Exchange Service
Port 19220 is assigned by IANA to cora (Client Connection Management and Data Exchange Service), cora-disc (Discovery for Client Connection Management and Data Exchange Service).
19220
How cora works
EmailMail servers hand messages to each other over port 19220, one hop at a time, until the recipient's server.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned2 registered services
- Range
- Registered (1024-49151)
- Category
Is port 19220 dangerous?
We have no specific security note for port 19220. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 19220
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| cora | 19220 | TCP | Client Connection Management and Data Exchange Service | - | 2016-11-10 |
| cora-disc | 19220 | UDP | Discovery for Client Connection Management and Data Exchange Service | - | 2016-11-10 |
// source: IANA service name and port number registry
Which program uses port 19220, and is it reachable?
Linux
sudo ss -ltnup 'sport = :19220' # process listening on 19220
sudo lsof -nP -i :19220macOS
sudo lsof -nP -i :19220
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 19220 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 19220 netstat -ano | findstr :19220
From another machine
nmap -p 19220 -sV <host> sudo nmap -sU -p 19220 <host> nc -zv <host> 19220
Block it in the firewall
sudo ufw deny 19220/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 19220" -Direction Inbound -LocalPort 19220 -Protocol TCP -Action Block # Windows
What is port 19220 used for?
Port 19220 is assigned by IANA to cora (Client Connection Management and Data Exchange Service), cora-disc (Discovery for Client Connection Management and Data Exchange Service).
Is port 19220 TCP or UDP?
Port 19220 is registered for TCP and UDP.
Is it safe to open port 19220?
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. Require TLS and authenticated submission.
How do I check if port 19220 is open?
On Linux run "ss -ltnup 'sport = :19220'", on macOS "lsof -nP -i :19220", and on Windows "netstat -ano | findstr :19220" to see the local process. From another machine, "nmap -p 19220 <host>" shows whether it is reachable.