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First connection
What the connection string is made of, and how to check the proxy works.
What you were given
After payment the order page shows four things: username, password, the gateway gw.dataimpulse.com and port 823. There is nothing else to configure — this is an ordinary HTTP proxy with username and password authentication.
The same credentials work in all 225 countries and in every program at once. There is no per-device connection: only traffic is spent.
One command to check
Substitute your own username and password. The reply carries an IP address and a country — that is the address sites will see.
curl -x http://LOGIN:PASSWORD@gw.dataimpulse.com:823 https://ipinfo.io/jsonIf nothing comes back
Check that the username and password were copied whole, with no trailing space. The password goes into the string as is; no quotes are needed around it.