Bug #3866 ado.net data provider bytefx unable to connect to specified hosts
Submitted: 23 May 2004 9:10 Modified: 24 Oct 2004 3:11
Reporter: Bugs System Email Updates:
Status: Not a Bug Impact on me:
Category:Connector / NET Severity:S2 (Serious)
Version:0.76 OS:Microsoft Windows (Windows XP Pro sp1)
Assigned to: Reggie Burnett CPU Architecture:Any

[23 May 2004 9:10] Bugs System
Using the ado.net connector in visual basic .net 2002 to interact with mysql 4.0.17 I'm using the connection string


it gives the exception "Unable to connect to any of the specified Mysql hosts" when I try to open the connection

I am able to connect to the database using a web interface and an odbc interface but am unable to connect to it using the .net connector.

How to repeat:
myConnection = New ByteFX.Data.MySqlClient.MySqlConnection("datasource=localhost;database=test;uid=tim;password=mypass;")
[7 Jun 2004 21:41] Manuel Sailer
The following exception is thrown for the connection string "Database=mysql;Server=localhost;User Id=****"
ByteFX.Data.MySqlClient.MySqlException: Unable to connect to any of the specified MySQL hosts ---> System.TypeLoadException: Invalid PInvoke metadata format.
   at System.Net.OSSOCK.gethostbyname(String host)
   at System.Net.Dns.GetHostByName(String hostName)
   at ByteFX.Data.Common.StreamCreator.GetStream(Int32 timeOut)
   at ByteFX.Data.MySqlClient.Driver.Open(MySqlConnectionString settings)
   --- End of inner exception stack trace ---
   at ByteFX.Data.MySqlClient.MySqlConnection.Open()

I tried also ";Password=" at the end of the connection string, as there is no password set for user id. Additionally I have to mention that it is no problem to connect to the data base using the mysql.exe client installed with MySQL server.
[10 Jun 2004 17:22] Martin Legris
I have experienced the exact same bug.

I did however download something called : MyByteFX.DataHelper. A precompiled executable of the dialog interface came with it in the /test directory. IT connects to the database server fine and fetches the available databases.

However when I tried recompiling the example I did hit the bug again.

I am using Visual Studio .NET Architect, but not the 2003 version. I noticed the project files that came with MyByteFX.DataHelper were 2003 version. Might that be the issue?

[10 Jun 2004 23:49] Reggie Burnett
Please check that you are using .NET 1.1.  The connector binary you downloaded is only compiled for 1.1 and would need to be built for .NET 1.0
[11 Jun 2004 15:52] Brian Morton
Same problem as above under win2k using vs.net enterprise architect 2002.
[26 Jun 2004 6:04] [ name withheld ]
I am experiencing this behavior also.  I am running VS2003 (.NET 1.1) and trying to connect to a remote server(on my lan) running MySQL.  The oConn.Open(); fails.

using ByteFX.Data.MySqlClient;
string strConn = "Data Source=tux;Database=DotNetTest;User ID=test;Password=test;";
string strCmd = "SELECT * FROM user";
MySqlConnection oConn = new MySqlConnection(strConn);

[MySqlException: Unable to connect to any of the specified MySQL hosts]
   MySQLTest.WebForm1.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\mysqltest\webform1.aspx.cs:28
   System.Web.UI.Control.OnLoad(EventArgs e)

MySQL Info
 Users having access to "DotNetTest"
 User  	 Host  	 Type  	 Privileges  	 Grant  	 Action 
test 	% 	global 	ALL PRIVILEGES 	Yes 	Edit
[6 Jul 2004 11:43] Oscar Acosta
I have the same problem using visual studio 2002 architect in w2k. Any solution?
[20 Jul 2004 15:58] Gleb None
Windows 2000 Pro SP4 ,VS 2003,.net 1.1,mysql 4.0.17. the same bug;any solution? =(
[27 Jul 2004 10:59] Lars
I experience that same problem on Win XP Pro, Visual Studio 20003 and ByteFX 0.7.6 on the client side. Server is MySQL 4.0 on Debian woody. 

Access to the server via GUI clients for Windows is fine.

Any progress on this?

[4 Aug 2004 17:11] Adrian Blunt
I had the same problem with Visual Studio .NET Professional 2002 and .NET SDK 1.1 until I discovered that even with .NET 1.1 installed, VS2002 still compiles against .NET 1.0, thus causing the connection to fail.

This can be solved at runtime by forcing your application to use the .NET 1.1 assemblies by creating an application configuration file ("<application>.exe.config") in the same folder as your application exe with the following contents:

<?xml version ="1.0"?>
   <supportedRuntime version="v1.1.4322" /> 

See MSDN Article "Targeting a .NET Framework" -http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcontargeti...

[18 Aug 2004 6:30] [ name withheld ]
I've got the same problem with Web Matrix Server and ByteFX.Data.MySqlClient, so I've tried a workaround using the xsp.exe server from Mono 1.0.1 for windows and it worked.
[20 Aug 2004 10:36] Frank Gillebaard
I had kinda the same problem. This is what happens:
If i make a connection and enter a correct username but a wrong password and then make connection with right username and right password i have same problem as everybody here describe.

next i added to the connect string Persist Security Info = true;

so the connect string looks like:

sMyConnection = "Persist Security Info = true;User Id=myusername;Password=mypassword;Data Source=grifal.nl"

and now all work fine now.
I use visual studio 2003 and visualbasic
met vriendelijke groet,
Frank Gillebaard.
[15 Oct 2004 19:45] Todd Fowler
Same situation as described from everyone else.
Tried the resolutions in a couple of the posts without any change in the error message.
Has anyone heard anything new on a resolution to this?
[21 Oct 2004 15:45] Ray Ward
The .net connector installer requires .NET 1.1 framework. So, I installed 1.1 and installation proceeded fine.

In my VB .NET (VS2003) application I added a reference to the dll
C:\Program Files\MySQL AB\Connector .NET\bin\.NET 1.1\MySql.Data.dll

I experienced the described problem using this library

However, I noticed that there is also a .NET 1.0 dll as well (C:\Program Files\MySQL AB\Connector .NET\bin\.NET 1.0\MySql.Data.dll) - despite 1.1 being needed to install...

Adding a reference to this library allowed a succesful connection.

Probably a visual studio bug (not using 1.1) rather than with mysql.
[24 Oct 2004 3:11] Reggie Burnett
Sorry, but the bug system is not the appropriate forum for asking
support questions. Your problem is not the result of a bug.
For a list of more appropriate places to ask for help using MySQL
products, please visit http://www.mysql.com/support/

Thank you for your interest in MySQL.

Additional info:

After reading the remaining posts on this bug, I think this not a code problem.  I will work on getting a 1.0 installer for future releases.
[3 Feb 2008 21:42] Olivier Goossens Bara
make sure your my.ini file does not have the "skip-networking" feature enabled. This is the default in some installations and disables tcp/ip connections.
[26 May 2010 13:41] Ajish joy
i am using ByteFX.MySqlClient.dll in my windows application 

i am getting error while trying to use at ByteFX.Data.MySqlClient.MySqlDataReader.Read() function 
as " specified method not supported " 

please anyone help me out on this scenario 

i am using of ByteFX.MySqlClient.dll