If a certain socket exception occurred when trying to establish a MySQL database connection, MySQL Connector/NET displayed an exception message that appeared to be unrelated to the underlying problem. This masked the problem and made diagnosing problems more difficult.

For example, if, when establishing a database connection via TCP/IP, Windows on the local machine allocated an ephemeral port that conflicted with a socket address still in use, then Windows/.NET would throw a socket exception with the following error text:

Only one usage of each socket address (protocol/network address/port) is normally
      permitted IP ADDRESS/PORT.

However, MySQL Connector/NET masked this socket exception and displayed an exception with the following text:

Unable to connect to any of the specified MySQL hosts.

(Bug#45021)

A SQL query string containing an escaped backslash caused an exception to be generated:

Index and length must refer to a location within the string.
      Parameter name: length
      at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean
      fAlwaysCopy)
      at MySql.Data.MySqlClient.MySqlTokenizer.NextParameter()
      at MySql.Data.MySqlClient.Statement.InternalBindParameters(String sql,
      MySqlParameterCollection parameters, MySqlPacket packet)
      at MySql.Data.MySqlClient.Statement.BindParameters()
      at MySql.Data.MySqlClient.PreparableStatement.Execute()
      at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior be‎havior)
      at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()

(Bug#44960)

The Microsoft Visual Studio solution file MySQL-VS2005.sln was invalid. Several projects could not be loaded and thus it was not possible to build MySQL Connector/NET from source. (Bug#44822)

The Data Set editor generated an error when attempts were made to modify insert, update or delete commands:

Error in WHERE clause near '@'.
      Unable to parse query text.

(Bug#44512)

The DataReader in MySQL Connector/NET 6.0.3 considered a BINARY(16) field as a GUID with a length of 16. (Bug#44507)

When creating a new DataSet the following error was generated:

Failed to open a connection to database.
      Cannot load type with name 'MySQL.Data.VisualStudio.StoredProcedureColumnEnumerator'

(Bug#44460)

The MySQL Connector/NET MySQLRoleProvider reported that there were no roles, even when roles existed. (Bug#44414)

MySQL Connector/NET was missing the capability to validate the server's certificate when using encryption. This made it possible to conduct a man-in-the-middle attack against the connection, which defeated the security provided by SSL. (Bug#38700)