ERR_UNSAFE_PORT
ERR_UNSAFE_PORT Error
What This Error Means
The ERR_UNSAFE_PORT error indicates that the browser refused to connect to the requested port because it is considered unsafe. Browsers block certain ports (like 22, 25, 110) to prevent attacks like NAT slipstreaming.
Common Causes
- Trying to access a web server on a restricted port (e.g., port 6000).
- Misconfigured links pointing to non-HTTP services.
- Developer testing on non-standard ports.
How to Fix It (For Users)
- 1 You cannot bypass this in modern browsers easily.
- 2 Contact the site owner to use a standard port.
For Site Owners / Developers
- Configure your web server to listen on standard ports (80, 443, 8080, 8443).
- Use a reverse proxy to map unsafe ports to standard ones.
- Avoid using ports listed in the browser's restricted port list.
When It Is NOT Your Fault
If the link you clicked specifies a blocked port.
Is the website actually down?
Sometimes the issue is just on your end. Check if the website is down for everyone or just you.
Check Website Status →