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UPDATE: The following is an official response from the CRA
The Canada Revenue Agency (CRA) places first priority on ensuring the confidentiality of taxpayer information.
We have received information concerning an Internet security vulnerability named the Heartbleed Bug. As a preventative measure, the CRA has temporarily shut down public access to our online services to safeguard the integrity of the information we hold. Applications include online services like EFILE, NETFILE, My Account, My Business Account and Represent a Client.
The CRA recognizes that this problem may represent a significant inconvenience for individual Canadians, representatives and businesses that count on the CRA for online information and services. Please be assured that we are fully engaged in resolving this matter and restoring online services as soon as possible in a manner that ensures the private information of Canadians remains safe and secure.
Please note that consideration will also be given to taxpayers who are unable to comply with their filing requirements because of this service interruption.
We are committed to investigating any potential impacts to taxpayer information. We will provide further information and daily updates at 3PM EST on our home page until the situation is resolved.
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Update - We have confirmed that the takedown is as a result of the Heartbleed Bug, however we are still waiting for an official response from the CRA.
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The secure section of the Canada Revenue Agency was taken down and replaced with this message sometime late yesterday or this morning.
This comes on the heels of a major announcement yesterday inv...olving a bug with the popular software OpenSSL that its used on an estimated over 60% of all secure websites. The software is used to provide encryption services to secure websites. More information can be found on the HeartBleed website. http://heartbleed.com/
We have been unable to confirm using the test tools available as the site is now offline. The communications office for Canada Revenue Agency was not immediately available for comment.
We will provide an update as it becomes available.