Networking

The Permission Denied (publickey,gssapi-keyex,gssapi-with-mic) error appears after a new package installation or the creation of new users on an SSH server. This tutorial shows you how to troubleshoot and fix this error.

The default MTU value on phoenixNAP's BMC servers is jumbo frames (9000 bytes). Learn about MTU and jumbo frames, and how to adjust it in Windows and Linux.

Learn how to use iptables commands and see how iptables works. By following the instructions listed in this article, you'll get a better understanding of network packets, and can configure basic rules for your system and set up ports on the firewall to meet your security needs.

Despite the reliability of Apache web servers, the "403 Forbidden" error is not uncommon. This tutorial goes over different issues that could cause the Apache "403 Forbidden" error and methods to fix them.

dig (Domain Information Groper) command is a tool for querying DNS name servers. It is a helpful command for diagnosing DNS problems but is also used to display DNS information. Learn how to use this command by following this article.

There are many potential causes for the "localhost refused to connect error". Troubleshoot the issue and learn how to solve the problem with this step by step guide.

This guide explains how to enable screen sharing on an Ubuntu system and remotely control it from another computer.

The Nmap hosted security tool can help you determine how well your firewall and security configuration is working. This guide will show you how to scan or check your Linux system for open ports using Nmap.

The Linux ping command is a powerful tool for troubleshooting and testing network connectivity. In this guide, we will walk you through some of the most useful ping commands with examples.

NGINX (pronounced "Engine X") is a web server application used to set up a reverse proxy. This guide provides an in-depth look into setting up a reverse proxy via NGINX.