Safesquid.cfg unable to find the proxy server

Hello, I have been trying to access the safesquid.cfg but couldn’t please let me know where am I wrong

here’s what all I did
I followed these Access The SafeSquid User Interface - Secure Web Gateway
and then when I am trying to access the safesquid.cfg

Unable to find the proxy server

Firefox is configured to use a proxy server that can’t be found.
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Please check if you are able to ping your proxy server using its IP address.
If you are getting response back from your server, then for initial stages configure the browsers proxy settings to the IP address of your proxy server and then try to access SafeSquids interface.