Port 427: SLP
Port 427 is the Service Location Protocol, which lets devices on a local network discover services such as printers without pre-configuration. It shows up in enterprise and VMware environments and is best kept off the internet.
| Port number | 427 |
|---|---|
| Service | Service Location Protocol |
| Protocol | TCP/UDP |
| Category | Routing |
| Default encryption | No |
Frequently asked questions
What is port 427 used for?
Port 427 is the Service Location Protocol, which lets devices on a local network discover services such as printers without pre-configuration. It shows up in enterprise and VMware environments and is best kept off the internet.
Is port 427 TCP or UDP?
Port 427 (SLP) uses TCP/UDP.
Is port 427 secure?
Port 427 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 427 on my firewall?
Only if you specifically need SLP. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.