Lost connection to MySQL server at ‘reading initial communication packet’

google-cloud-platform

I have a google cloud instance, which connects to a google cloud SQL database. This morning the connection was lost, and I recieved the following error: Lost connection to MySQL server at 'reading initial communication packet'

The connection was up and running for one month now end without any change, the connection was lost.
I tried restarting the SQL instance several times, but without any luck.
Als on the google Cloud Developers Console, the page databases (on my sql instance), won't show. (error: Failed to load)

I think it's a connection failure at google, But how to be sure?

Both cloud instance and SQl instance are on zone europe.

Thanks

Best Answer

There are several Cloud SQL issues that can cause Lost connection to MySQL server at 'reading initial communication packet'. The most common are:

  • Connecting from an IP or GAE app that is not authorized on the ACL.
  • You have reached one of the connection limits.
  • Your instance has an activation policy of NEVER.
  • This can also temporarily happen while an instance is being restarted.
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