Fix Destination Host Unreachable Ping Error Reply

Published by: Alex George

During my network engineer career, one of the common ICMP errors I received while troubleshooting connectivity issues was Destination Host Unreachable.

This error was the cause of my Internet connectivity problems most times.

The same can be true for you too.


When you troubleshoot your connectivity problems, the chances of getting this ping error reply are very high.


Once you learn to resolve this error, you can fix most of your Internet connectivity problems. In this tutorial, I will explain everything about this error.


This tutorial has three parts.


  1. The first part of this tutorial explains the meaning of the ICMP reply Destination Host Unreachable.


  2. The second part explains the reasons for the ping reply Destination Host Unreachable.


  3. The third part explains the steps to fix this error message.


So, let us check the meaning of the ping reply Destination Host Unreachable.




What Does Destination Host Unreachable Ping Reply Mean?

Before proceeding to the core of this tutorial, let me explain the meaning of this ping reply.


The Destination Host Unreachable error tells that the ping packets from your computer couldn't find a route to the destination IP address(destination host).


Now you understand the meaning of this ping reply. However, you should ask yourself two questions to learn more.


  1. Who replied to your device with this Destination Host Unreachable message?



  2. Why the ping packets from your computer failed to reach the destination address?


Let me answer the questions one by one. But before I explain the first question, you must learn how the ping operation works.


Let us check how Ping works.


I am pinging my blog by typing ping www.corenetworkz.com on the Command Prompt.

The complete process is below.


My computer sends ICMP Echo Requests to the remote host www.CoreNetworkZ.com.


  • ICMP Echo Requests travel out of my computer through the network adapter.


  • Ping packets reach the default gateway. The default gateway is the router in most cases.


  • The default gateway needs to find a route to the destination address. So, the next step is checking the ARP table and Routing table.


  • Default Gateway finds a route to the Remote Gateway of the destination IP address.


  • Remote Gateway receives the packets.


  • Remote Gateway forwards the ping packets to the remote host (the final destination - server of CoreNetworkZ.com).


  • The Remote Host (web server of CoreNetworkZ.com) acknowledges by sending ICMP Echo Replies.


Can you tell me the potential sources for a Destination Host Unreachable reply from this ping workflow algorithm?

You can get this reply from two possible sources.


  1. Your Default Gateway


  2. Remote Gateway



How do we know whether the reply comes from the Default Gateway or Remote Gateway?

Well, it is simple.

All you have to do is to analyze the ping reply carefully.

Check the format of the message. It comes in two different forms.



  1. Reply from x.x.x.x Destination Host Unreachable

    If you see the following format, check the IP address.


    Most of the time, x.x.x.x must be a Remote Gateway address.


    Which shows the error message you received is from the Remote Gateway.



  2. Destination Host Unreachable

    If you don't see an IP address in the error replies, they came from the Default Gateway.


    In a home network, your home router is the Default Gateway.


Both error formats have different reasons. I will explain the reasons in the next part.




Reasons to Get the ICMP Error Destination Host Unreachable

Let us check why your computer displays the message Reply From x.x.x.x Destination Host Unreachable.

Have a look at the list below.

One of the reasons listed below can get you to the ICMP Echo message Destination Host Unreachable.


  1. Your Default Gateway doesn't know the route to the destination IP address.


  2. Packet Routing issues on Remote Gateway.


  3. The destination host might be down.


  4. Loose Connection.


  5. Strict Firewall Settings.



One of the frequent questions I receive from our readers is whether this error is related to Operating Systems ( like Windows and Linux ).

The answer is no.



Analyzing the ICMP Echo Destination Host Unreachable

Let me explain why I received this ICMP Echo Reply by analyzing a live example.

I send ping packets to the global DNS address 4.2.2.2 to troubleshoot the connectivity problem. The screenshot below shows the reply I received.


ICMP error message Destination Host Unreachable

Microsoft Windows [Version 6.1.7600] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\corenetworkz;ping 4.2.2.2 Pinging 4.2.2.2 with 32 bytes of data: Destination host unreachable. Destination host unreachable. Destination host unreachable. Destination host unreachable. Ping statistics for 4.2.2.2: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), C:\corenetworkz>


Which format is this?

It is the second format of the Destination Host Unreachable error.

The final part of this tutorial explains the procedure to fix the ICMP Error Reply Destination Host Unreachable.

To understand more, I recommend you check the discussions by visiting the link below.




How to Fix Ping Error Destination Host Unreachable?

If you do not want to go into the complexity of this ICMP Echo Reply, you can follow the instructions below to resolve the Destination Host Unreachable Ping error message.



  1. Turn Off The Firewall

    Aggressive firewall settings can interrupt the ICMP Echo Requests and cause the Destination Host Unreachable error.


    Turn Off the Firewall to check whether the firewall is the reason for this issue on your computer.


    Try to access the Internet after the firewall is Off.

    Also, Ping a Web URL and check whether the issue persists. If so, go to the second solution.



  2. Power Cycle The Network

    A loose connection in your home network can invite the Destination Host Unreachable ICMP Echo Reply.


    Outdated Routing and ARP tables also result in Ping errors.


    A proper home network Power Cycle can fix this. Let us check the steps.


    • Switch off every device in the network.


    • Disconnect power cables from Modem, PC, and Router.


    • Disconnect the Ethernet cables from Modem, Computer, and Router.


    • Reconnect the power and ethernet cables.


    • Power On the Modem and wait for one minute.


    • Power On the Router and wait for one minute.


    • Power On the PC and ping Google to check whether the Destination Host Unreachable error persists.


    A proper Power Cycle will fix issues like corrupted ARP and Routing tables and loose connections.


    If the issue persists, go to the final solution.



  3. Disable IPv6 and Test the Connectivity

    Sometimes devices fall into IP version conflicts. Different operating systems have separate IP version priorities.


    Windows 10 prefers IPv6 to IPv4. Linux variants like Ubuntu, Fedora, and Debian prefer IPv6 to IPv4.


    However, sometimes devices fail to work with IPv6.

    Rarely it results in ICMP error messages. We can check it by turning off the IPv6 on your device.

    Let us check how to turn off the IP Version 6 on a Windows 11 computer and test whether it fixes the Destination Host Unreachable issue.



    • Right-click on the Network Adapter at the system tray.

    • Click on Open Network & Internet settings.

    • Click on Change Adapter options.

    • Right Click on the current connection and click properties.

    • Uncheck the Internet Protocol Version 6 (TCP/IPv6).

    • Click OK

    • Reboot your Computer.

    Once you reboot your computer, check for the connection.


You have learned to troubleshoot the Destination Host Unreachable Ping error message on Windows and Linux Systems and fix it.

We suggest you read similar tutorials to learn more about Computer Network Troubleshooting.




About The Author:

Alex George is a Microsoft and Cisco Certified Network Engineer. He has been working as a network engineer for more than ten years.

His Professional Qualifications: CCNA, CCNP, and MCSE.

32 comments:

  1. Outstanding and simple article. Thank you.

    Michael D. Waters
    www.mdwaters.com

    ReplyDelete
  2. Anonymous1:40 AM

    i dint like it..._|_

    ReplyDelete
    Replies
    1. Can you provide more details?

      Is there any solution I forgot to mention here for the above error?

      Delete
  3. Very Helpful Article. I just disabled my Firewall as per you directed and next moment the error destination host unreachable disappeared. Thanks again

    ReplyDelete
  4. Anonymous12:49 AM

    Thanks for the help

    ReplyDelete
  5. Anonymous11:27 PM

    Thank you so much. I usually get Destination Host Unreachable error message while ping to my server IP. Now I understand thanks

    ReplyDelete
  6. Anonymous6:42 PM

    I just solved this problem across part of a network in which half of the workstations would receive this error message when trying to PING the server and half could successfully PING the server. In my case (after looking everywhere else first) this turned out to be a defective network switch!

    ReplyDelete
  7. Anonymous9:14 PM

    Pretty nice work mate, it would be better if you can post something which is limited to home networks and devices connected to it.
    Thanks you have ignited good info in my mind...thanks

    ReplyDelete
  8. Anonymous1:05 AM

    I remember this error message destination host unreachable but I completely forget when I saw it and what I was doing. Anyway it just disappeared from my computer without doing any. Now only I understand the real cause of this. Thanks..

    Toni

    ReplyDelete
  9. I think this error is something with my Firewall. I did exactly the same steps you mentioned and now it is fine.

    ReplyDelete
  10. David2:39 AM

    Thanks for your tutorial. Now I know why I am getting this.

    ReplyDelete
  11. Anonymous3:35 AM

    Will I get Destination host error message if I unplug the computer right after sending the ping command?

    ReplyDelete
  12. Siju George2:18 AM

    To get Destination host unreachable message, ping request from your computer should reach remote gateway.

    ReplyDelete
  13. Anonymous10:01 PM

    I have connected a pfSense box on WAN, directly to a simple Linksys router on LAN. When I ping the Linksys from the pfSense box I keep getting A RANDOM MIX OF "Destination Host Unreachable", timeouts and fast normal responses (3ms). How is that possible?

    ReplyDelete
  14. Admin2:17 AM

    In order to check this issue, I request you to tell us the exact network diagram with IP addresses assigned to each devices.

    ReplyDelete
  15. Anonymous2:17 AM

    Ive already tried the power modem cycle many times but it still didnot work. Are there any other options?

    ReplyDelete
  16. Admin3:41 AM

    Have you disabled the firewall and check for the issue ?

    ReplyDelete
  17. Excellent

    ReplyDelete
  18. Anonymous9:57 PM

    i connect the internet cable means my remote server if working .. but i use vm Vshpere means the destination host unreachable error will came.

    ReplyDelete
  19. I tried everything, still doesn't work

    ReplyDelete
  20. @Devry85225,

    Can you provide some more details ?

    1. Are you able to go online from other devices using the same network?

    2. Which device you are using and which OS?

    ReplyDelete
  21. can you tell me about how to connect two mail servers with two routers to send the mail?

    ReplyDelete
  22. can you tell me about how to connect two mail servers with two routers for send the mail?

    ReplyDelete
  23. @ Joe

    Thanks for adding your solution to this tutorial.

    ReplyDelete
  24. Cctv in ping showing destination host unreacheable from 5days and video loss in screen showing and in command promt cmd it showing media disconnected please help and reply with reason

    ReplyDelete
  25. @ Unknown

    It is difficult to answer your question without knowing your network diagram. However, from the information you provided, you need to check the connection between your CCTV and the router.

    Media disconnected shows there is no connection to your CCTV. Is your CCTV connected to your network via cable or wireless?

    How do you assign IP address to your CCTV?

    ReplyDelete
  26. One of the best and simple explanations.

    ReplyDelete
    Replies
    1. Thank you Ashok for your appreciation.

      Delete
  27. Anonymous7:06 AM

    I got same message, destination host unreachable,
    But it says all 4 sent and received, % lost

    ReplyDelete
  28. Nice article.. What if the "Reply from xx.xx.xx.xx: Destination host unreachable" is a different IP address than what the ping request I sent. Sending a remote ping to a static IP coming back with a different number. My ISP tells me to factory default the router. (It is brand new ) Thanks..

    ReplyDelete
    Replies
    1. That means it is one of the router in between your device and the destination.

      Delete

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