The trouble in executing the command is mostly caused by the ConnectionString for the SQL connection. As already mentioned, you need to test the ConnectionString and the server name that you're calling the data from.
You can get the connectionStrings from
http://www.connectionstrings.com/mysql/[
^]. Mostly, the Server part is the part that you need to focus on the most. Because you connect to the server in that part of the string. So, specifying the IP address, Server name would go there.
Also, make sure that the remote connection for every user or the required users is allowed,
http://stackoverflow.com/questions/8380797/enable-remote-mysql-connection[
^]. Give this a read.