Sometimes the webservice for updating the currency exchange rates is not available and you might get the WARNING: Cannot retrieve rate from http://www.webservicex.net/CurrencyConvertor.asmx… error by mail or in some log file.
This problem can be solved with the free FixerIOCurrencyImport extension.
Solving the “Cannot retrieve rate from http://www.webservicex.net/CurrencyConvertor.asmx” error
Need help implementing this solution, or still looking for a fix to your Magento problem? Get in touch and I will be happy to help with your project.