Port 9100: JetDirect
Port 9100 is raw, or JetDirect, printing, where a print job is sent directly to a network printer without a print-spooler protocol wrapping it. It is also, coincidentally, the conventional port for the Prometheus Node Exporter, so check which service you actually mean before troubleshooting.
| Port number | 9100 |
|---|---|
| Service | Raw / HP JetDirect printing |
| Protocol | TCP |
| Category | Printing |
| Default encryption | No |
Frequently asked questions
What is port 9100 used for?
Port 9100 is raw, or JetDirect, printing, where a print job is sent directly to a network printer without a print-spooler protocol wrapping it. It is also, coincidentally, the conventional port for the Prometheus Node Exporter, so check which service you actually mean before troubleshooting.
Is port 9100 TCP or UDP?
Port 9100 (JetDirect) uses TCP.
Is port 9100 secure?
Port 9100 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 9100 on my firewall?
Only if you specifically need JetDirect. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.