i believe your computer may be experiencing an issue with system environment variables as it cannot recogise the Ping command.
Here is a post that has fixed someones issue :
If you cannot get this working, then we can look at releasing a patch update, but for most people the update is working fine

Let me know how it goes.
Edit: I am testing a new version of skyline that has an updated connection system. But this would exist for the next update.
Edit2: I have done a test with the new environment variable and it seems to be working.
Note: Remember for environment variables to take effect, you need to reboot or log off.