Problem using WNetAddConnection2 on 2 different Web Server

[Chimerique]

Hello there, here my first post ^^

I'm developping a web application that sometimes acces a shared drive not in the Domain with a local machine logon/password.

For that I'm using some code found on the net (WNetAddConnection2A) and it's working pretty well ....

But then I moved my web application to an other server, and now I got a 1312 error (System error 1312 has occurred - - A specified logon session does not exist. It may already have been terminated.)

So basicly I have 2 Web Server in the same domain and one shared folder not in the domaine protected by a local machine account.
It's working perfectly on one of the web server and not on the other. They both have the same security configutation in IIS ...

Some code sample :

//WIN32API - WNetAddConnection2
        [DllImport("mpr.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
        private static extern int WNetAddConnection2A(
            [MarshalAs(UnmanagedType.LPArray)]
            NETRESOURCE[] lpNetResource
            ,
            [MarshalAs(UnmanagedType.LPStr)]
            string lpPassword
            ,
            [MarshalAs(UnmanagedType.LPStr)]
            string lpUserName
            ,
            int dwFlags
            );
 
public static void ConnectAs(string pShare, string pDomain, string pUser, string pPwd)
        {
            int err = 0;
            try
            {
                string sUser = string.Empty;
                if (pDomain.Length < 0)
                    sUser = pDomain + "\\" + pUser;
                else
                    sUser = pUser;
                int dwFlags = 0;
                pShare = GetServerName(pShare);
                NETRESOURCE[] nr = new NETRESOURCE[1];
                nr[0].lpRemoteName = pShare;
                nr[0].lpLocalName = "";  //mLocalName;
                nr[0].dwType = 1;     //disk
                //nr[0].dwDisplayType = 0;
                //nr[0].dwScope = 0;
                //nr[0].dwUsage = 0;
                //nr[0].lpComment = "";
                //nr[0].lpProvider = "";
                err = WNetAddConnection2A(nr, pPwd, sUser, dwFlags);
                if (err != 0)
                    throw new Exception("Unable to connect to " + pShare
                        + ".  Error=" + err.ToString());
            }
            catch(Exception ex)
            {
                throw new Exception("Fatal error : " + ex.ToString());
            }
        }
 

Hope it's clear, thx for your help

[kenobewan]

I believe that this may happen when the user account exists on one server but not the other. HTH.