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 on 
a domain computer other than the database server itself, I got following error 
messages. And the program works without error on the database server itself. 
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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