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Problem

When installing or upgrading Koongo Connector through Magento Connect Manager you may get this error on frontend as well as backend:

  • 503 Service Temporarily Unavailable

This known Magento issue, it does not relate to our connector and solution is straightforward.

Solution

Check if there is a file called maintenance.flag in your Magento root. If so Delete it.

When Magento is performing certain tasks it temporarily creates this file. Magento checks for its existence and if it's there will send users to the page you described.

It's supposed to automatically delete this file when done processing whatever task it was doing, but I've experienced occasions where something went wrong and it failed to delete it.

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