Cannot Ping 127.0.0.1 and No Reply From Local Host

When we send ping packets to local host or loopback address (127.0.0.1 to 127.255.255.254), they will be rerouted to the PC. Even if your Ethernet adapter is not connected to any modem or router, you will get valid reply when you ping loopback IP. However, in some cases you may not get replies from 127.0.0.1 and this article explains the reasons for it.


Reasons For No Replies From 127.0.0.1

There are two reasons which prevents your computer from getting replies from 127.0.0.1. They are provide dbelow.
  1. TCP/IP suit installed on your laptop is corrupted

  2. Ethernet adapter is not working

Fix

Now let us troubleshoot each cases.

  1. Reset TCP/IP

    To fix issue with TCP/IP suit on your computer, use the following commands. You can type them on Command Prompt one by one and then check for the issue.

    • ipconfig /flushdns

    • netsh int ip reset c:\tcp.txt

    • netsh winsock reset

    After resetting the windows socket and TCP/IP suit, we need to restart the PC. After restarting the computer we need to check whether the issue persist or not. If still we cannot ping the loop back address the only possible chance is corrupted Ethernet Adapter.

  2. Test Adapter

    Since the TCP/IP suit is installed properly, only reason that may prevent local host from communicating properly is the faulty Ethernet adapter. We can test the status of an adapter in device manager. To learn it properly, I recommend you to follow the instructions provided in the link below.
    Test an Adapter in Device Manager


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