As a Linux user who uses their PC every day, one of the last messages you want to see on your screen is “No route to host.” Have you come across the ‘No Route to Host’ while trying to reach a server on Linux?. In this article, we will be talking about how to fix the “No Route to Host” Connection Error on Linux.
However, this is a very annoying error report, especially when you are in a hurry to get something done. If you’re getting this message, it means your PC can’t reach the target server, whether a local server daemon is running on your system or a remote server that you can’t access.
Why Am I Getting the “No Route to Host” error?
There are many reasons why you could be getting that error. But unfortunately, networking in Linux is a pretty intricate and somewhat complicated stack, and as a result, it’s tough to determine exactly where the issue is.
What are the causes of the “No Route to Host” Connection Error on Linux
Try all possible fixes for you to learn what’s the cause of the problem and how do you fix it:
1. Check your Network Settings
Before diving into more specific causes, we recommend you double-check your Network Settings and learn if you can connect to the web or if your DNS is properly configured.
2. Check if the Host is Offline or Service isn’t Running
The error report may be because the server you’re trying to reach is down for maintenance or experiencing some difficult issues. If you notice the server you’re trying to connect to is not online, then this is the cause of the problem.
However, there is a way for you to check is the server is online or down for maintenance. You can do that with Systemd, run the following command:
1. sudo systemctl status SERVICENAME
3. Check if you’re Connecting to the Right Port
Connecting to the right Port is very important because It’s common for server managers to lock down ports that aren’t used to improve server security against attackers.
However, we strongly recommend installing a Security tool to figure out open and secure ports. In this walkthrough, we will be making use of NMAP.
Here are the commands for installing NMAP across different Linux distributions:
CentOS: yum install nmap
Debian: apt-get install nmap
Ubuntu: sudo apt-get install nmap
Once the NMAP installation is done, check to see open ports with the following command:
sudo nmap -sS target-server-ip
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