- 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.
Port 78: vettcp
Port 78 is assigned by IANA to vettcp (vettcp).
78
How vettcp works
Other servicesThe client sends a request to port 78 and the vettcp 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
- Well-known (0-1023)
- Category
- Other services
Is port 78 dangerous?
We have no specific security note for port 78. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 78
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| vettcp | 78 | TCP, UDP | vettcp | - | - |
// source: IANA service name and port number registry
Which program uses port 78, and is it reachable?
Linux
sudo ss -ltnup 'sport = :78' # process listening on 78
sudo lsof -nP -i :78macOS
sudo lsof -nP -i :78
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 78 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 78 netstat -ano | findstr :78
From another machine
nmap -p 78 -sV <host> sudo nmap -sU -p 78 <host> nc -zv <host> 78
Block it in the firewall
sudo ufw deny 78/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 78" -Direction Inbound -LocalPort 78 -Protocol TCP -Action Block # Windows
What is port 78 used for?
Port 78 is assigned by IANA to vettcp (vettcp).
Is port 78 TCP or UDP?
Port 78 is registered for TCP and UDP.
Is it safe to open port 78?
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 78 is open?
On Linux run "ss -ltnup 'sport = :78'", on macOS "lsof -nP -i :78", and on Windows "netstat -ano | findstr :78" to see the local process. From another machine, "nmap -p 78 <host>" shows whether it is reachable.
Other other services ports
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