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As of Magneto 1.9.3 magento have finally added brute force protection to the downloader folder. As you may be aware even if you have changed your default admin path ie to anything other that /admin Magento connection is still accessible at yourdomain.com/downloader. The fix for this is to rename your downloader folder or move it out of the root folder so that it is not accessable. However, in order to use Connect you need to rename and it had a tendancy to be forgotten. This means that the whole of the internet can have as many guesses at your usernames and passwords as they like.As of Magneto 1.9.3 magento have finally ad