In the event that your network is behind a firewall, you will need to whitelist Totango IP addresses in order to create a connection to your data source.
Depending on the data center that holds your data, whitelist the following IP addresses to allow access to retrieve data from your servers.
To know which data center your service is using, refer to the URL when logged into Totango. US servers include t01, whereas EU servers include t11. Totango Community Edition is on the US data center.
US data center
EU data center
Once whitelisting is in place, you should be able to connect successfully for the selected data source.