Hi te36051,
Interesting! Thanks for sharing the solution. I wasn't familiar with that mysql option. The same problem may be solvable by modifying the connection string to use whatever pipe that configuration was creating. Some relevant information here: https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-configuration-properties.html
But, I would think binding the loopback address (127.0.0.1) would be adequate for most situations.