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In general, this error occurs when the Mysql process is not running, when this happens, I restart the application and access the site or send a ping, check if the process "mysqld" appears in Process explorer I try to access through the button "manager".
One of the causes also for this type of error, is to have one more application phpMyadmin installed, being a native and can be installed via KUDU in site Extensions, recommend remove if you have, or will have to configure it manually.
Source: Microsoft site
Kind of off: but tell me, do you really think it’s a good idea to let an application like this run on your server? In addition to being a kind of heavy application it can still be a great opportunity for malicious users to try to hack something, not that they will succeed, but if you have no experience with configuration of this type is well able to leave some fault, has a lot of things to solve with applications directly on your computer, even phpmyadmin can stay on your computer and vc synchronize with your mysql-server
– Guilherme Nascimento
I understand your line of thinking. but the applications are simple with the aim of hosting content for study or dissemination of academic projects.
– alexjosesilva
It has nothing to do with the purpose of the site, it has to do with security, invaders do not care about purpose, each one has its own reasons, even just "mess", the problem is in the use of a tool which can contain sploits or not and in their experience with the use of it. If you notice many hosting that already contain phpMyAdmin usually only release it to use if you access it from their dashboard, ie is not a "so public" address. The understanding of security is not something easy.
– Guilherme Nascimento
That is to use this application for academic purposes and accept the oscillation regarding availability ???
– alexjosesilva
It’s not about the application or the ends. It has to do with being something that is in a public address available to different people, which can be shared, adding the possibility of sploits in phpmyadmin (depending on whether you do not update it may appear some unknown sploit yet), you may as well use a desktop database control application and synchronize with your server (preferably using security cryptographic on mysql-server)... As I said, this has nothing to do with your mistake, it’s an off-topic situation.
– Guilherme Nascimento