I'm receiving the similar issue. The only difference is I'm trying to pull stats from a single dedicated server and have also added the server ip on the sql access list.
console returns
ExType: MySqlException
Failed to initialize plugin 'BetterStatistics v1.0.17' (SocketException: Operation on non-blocking socket would block)
at System.Net.Sockets.Socket.Receive (System.Byte[] buffer, System.Int32 offset, System.Int32 size, System.Net.Sockets.SocketFlags socketFlags) [0x00016] in <14e3453b740b4bd690e8d4e5a013a715>:0
at System.Net.Sockets.NetworkStream.Read (System.Byte[] buffer, System.Int32 offset, System.Int32 size) [0x0009b] in <14e3453b740b4bd690e8d4e5a013a715>:0