There are many ways to connect to the K2 Server which all vary depending on what you want to do. I found myself in a situation where I need to create a connection as a particular user and the usual way to connect to the K2 Server (as seen at the end of this post) was giving authentication issues. Remember, I am talking about making a connection to the K2 Server (default port 5252) and NOT the SmartObject server (default port 5555).

Here is the good way to connect that worked:

ConnectionSetup consetup = new ConnectionSetup();

consetup.ConnectionString = "DOMAIN,USER,PASSWORD";

conn.Open(consetup);

 

I dug around on the K2 Underground and found some addition code around the ConnectionSetup object for alternative ways to connect to the K2 Server, and found the following:

 

using (Connection K2Con = new Connection())
{
    ConnectionSetup K2ConSetup = new ConnectionSetup()

    K2ConSetup.ConnectionParameters.Add(ConnectionSetup.ParamKeys.Host, ConfigurationManager.AppSettings["K2Server"]);

    K2ConSetup.ConnectionParameters.Add(ConnectionSetup.ParamKeys.TimeOut,  ConfigurationManager.AppSettings["K2ConnTimeOut"]);

    //Open a connection to the K2[blackpearl] server

    K2Con.Open(K2ConSetup);
    K2Con.ImpersonateUser(Profile.GetValue("WindowsLogin"));
    nameLabel.Text = K2Con.User.Name;

    Worklist K2WorkList = K2Con.OpenWorklist("ASP");

    K2Con.RevertUser();

    ... more code

    K2Con.Close()

}

Other connection options include:

SourceCode.Workflow.Client.Connection conn = new SourceCode.Workflow.Client.Connection();
conn.Open("[HOST]");

//or if you wish to open the connection as a specfic user replace conn.Open("[HOST]") with:

conn.Open("[HOST]", "[DOMAIN], [USER], [PASSWORD");

I am confident that using one of the methods above you will successfully be able to connect to the K2 Server.