By Austin
Here is a screen grab of ‘grep “Failed password” /var/log/auth.log’ for reference: https://imgur.com/a/G2bwrZO
I have the port range 30999:59999 set to DENY IN from ANYWHERE for udp and tcp traffic, yet I’m still receiving login attempts within the ranges of blocked ports.
Can anybody spot a misconfiguration, or perhaps explain what I’m missing with UFW?
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Hi there,
Those ports are the port on the clients that are trying to connect to your SSH service.
Most outgoing connections on a system are made from the upper port ranges. For example on Linux, outgoing ports are chosen from 32768 - 61000 by default.
So to prevent this from happening, you actually need to close down port 22 on your server.
You could do that and then only allow your own IP address to access that port.
Hope that this helps.
Best,
Bobby
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and AI-native businesses
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Start building today
From GPU-powered inference and Kubernetes to managed databases and storage, get everything you need to build, scale, and deploy intelligent applications.
