Core Apps » Orfox Private Browser

I use an samsung tablet 4 with orfox browser, it runs. After I turn the tablet off some days ago, I can`t get a connection, because I get the messsage:
"The proxy server is refusing connections
Firefox is configured to use a proxy server that is refusing connections.
1.Check the proxy settings to make sure that they are correct.
2.Contact your network administrator to make sure the proxy server is working."

What can I do?
I haven't any knowledge about internet issue and I've searched in the web to find a solution, but I didn't find something.

Thanks!
M.R.