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User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
  Posted by Toni Cordon Batlle on June 28, 2011
This can occurr if you set an incorrect "Plugin" on "User" table in "mysql" database.

Connecting from PHP using Authentication parameters, from a user with incorrect "Plugin", makes PHP can't connect, and shown the error message "Warning: mysql_connect() [function.mysql-connect]: Client does not support authentication protocol requested by server; consider upgrading MySQL client"

Best regards
  Posted by Charles Peterson on June 4, 2013
--secure-auth is default on after 5.6.?

you may need to disable this also if using an old mysql client.
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