Npgsql Integrated Authentication Problem

Hi;

I have set up a windows domain trying to run Postgres client using SSPI.
I've reached a point that I can use psql to login from my client machine
without specifying username and password. But everytime I ran my .NET client
program, I got following error messages. Any help is much appreciated!

Ying

Message:FATAL: XX000: could not accept SSPI security context
BaseMessage:could not accept SSPI security context
Detail:The token supplied to the function is invalid
 (80090308)
Source:Npgsql
TargetSite:Boolean MoveNext()

My code is very simple:

NpgsqlEventLog.Level = LogLevel.Debug;
NpgsqlEventLog.LogName = "NpgsqlEventLog.txt";
NpgsqlConnectionStringBuilder pgsqlCSB = new
NpgsqlConnectionStringBuilder();
pgsqlCSB.Database = "test";
pgsqlCSB.IntegratedSecurity = true;
pgsqlCSB.Host = "VM-WIN2008";
pgsqlCSB.Port = 5432;
NpgsqlConnection pgsqlConn = new
NpgsqlConnection(pgsqlCSB.ConnectionString);
pgsqlConn.Open();
DataTable dt = pgsqlConn.GetSchema();

More log message from NpgsqlEventLog.txt:

3/20/2013 10:31:38 AM    1316    Debug    Entering NpgsqlClosedState.Open()
3/20/2013 10:31:38 AM    1316    Debug    Attempt to connect to '192.168.73.141'.
3/20/2013 10:31:38 AM    1316    Normal    Connected to: VM-WIN2008:5432.
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlStartupPacket.NpgsqlStartupPacket()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlStartupPacket.WriteToStream()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlStartupPacket.WriteToStream_Ver_3()
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: user.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: ylu.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: database.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: test.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: DateStyle.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteString()
3/20/2013 10:31:38 AM    1316    Debug    String written: ISO.
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlState.ProcessBackendResponses()
3/20/2013 10:31:38 AM    1316    Debug    AuthenticationRequest message received from
server.
3/20/2013 10:31:38 AM    1316    Debug    Entering NpgsqlStartupState.Authenticate()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlPasswordPacket.NpgsqlPasswordPacket()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlPasswordPacket.WriteToStream()
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteBytes()
3/20/2013 10:31:38 AM    1316    Debug    Unable to find resource string
Log_BytesWritten for class PGUtil
3/20/2013 10:31:38 AM    1316    Debug    AuthenticationRequest message received from
server.
3/20/2013 10:31:38 AM    1316    Debug    Entering NpgsqlStartupState.Authenticate()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlPasswordPacket.NpgsqlPasswordPacket()
3/20/2013 10:31:38 AM    1316    Debug    Entering
NpgsqlPasswordPacket.WriteToStream()
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.WriteBytes()
3/20/2013 10:31:38 AM    1316    Debug    Unable to find resource string
Log_BytesWritten for class PGUtil
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: FATAL.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: XX000.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: could not accept SSPI security
context.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: The token supplied to the
function is invalid
 (80090308).
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: src\backend\libpq\auth.c.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: 1220.
3/20/2013 10:31:38 AM    1316    Debug    Entering PGUtil.ReadString()
3/20/2013 10:31:38 AM    1316    Debug    Get NpgsqlEventLog.LogLevel
3/20/2013 10:31:38 AM    1316    Debug    String read: pg_SSPI_error.
3/20/2013 10:31:38 AM    1316    Debug    ErrorResponse message from Server: could
not accept SSPI security context.
3/20/2013 10:31:38 AM    1316    Normal    An NpgsqlException occured: FATAL: XX000:
could not accept SSPI security context.



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