The Hamachi server has denied your login request

I ran into this problem after upgrading an older version of Hamachi:

The Hamachi server has denied your login request.

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Simple Solution

This page is very popular, so I wrote an application that will reset the Hamachi configuration. The application is the simplest solution, but the steps below do the same job. Download the application here (source is on BitBucket).

You may need to restart your computer after running this program. Please let me know in the comments below whether the application fixes your problem.It looks like this program does not work on all operating systems and fix this error for all people. Your mileage may vary - feel free to contribute to the source code with your own situation.

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The way I solved this problem was to delete the Hamachi configuration files. Procmon was able to locate the configuration folders:

• Depending on your system, one of:

  %WinDir%\System32\Config\SystemProfile\AppData\Local\LogMeIn Hamachi

  %USERPROFILE%\..\LocalService\Local Settings\Application Data\LogMeIn Hamachi

• And:

  %USERPROFILE%\Local Settings\Application Data\LogMeIn Hamachi

Below are steps you could use to clear the corrupted configuration on Windows.

1. Start an elevated command prompt. In Windows 7 and Vista, press the Windows key or click on the Start menu, then type cmd into the text field at the bottom of the Start menu. Right click on the cmd icon at the top of the Start menu and click Run as administrator - you will need to either enter an administrator password or accept the dialog that pops up next. If you do this correctly, a black window called the command prompt will pop up.
2. Copy this command line. Double click the command below to select it, and then press Ctrl+C or right click and select Copy to copy the command into the clipboard of your computer.

   cmd /c rd /s/q "%USERPROFILE%\..\LocalService\Local Settings\Application Data\LogMeIn Hamachi" & rd /s/q "%USERPROFILE%\Local Settings\Application Data\LogMeIn Hamachi" & rd /s/q "%WinDir%\System32\Config\SystemProfile\AppData\Local\LogMeIn Hamachi"

3. Run the command line. Paste the command into the black window and hit enter to run it. It should reset your Hamachi configuration files and fix the problem.

Please let me know by commenting below if this works or not for your particular situation, along with the version of Hamachi you are running if you know it.