Named pipes Windows (OpenG implementation)

Greetings,
I've run into a few issues with the OpenG Named Pipes implementation (by rolfk). I am unsure how much of this is due to my inexperience with pipes and how much is caused by the aging OpenG (beta) implementation.
Usage:
I want to pick up existing named pipes with LabVIEW to read data from them. Basic test case (simple example .vi from OpenG library) works (attached screenie 1).
Problem:
If I try to pick up pipe opened in separate .vi (or external to LabVIEW by third party software) I get error 42 when attempting to read it (screenie 2)
Questions:
Is there a resource to determine what the error codes cover? (I've also seen error 8, screenie 3, but only found description for error 6)
Is there reason to believe that the named pipe implementation no longer functions in Win7/LV8?
Am I butchering proper named pipe procedure and use?
Thank you in advance for your consideration!
Nicolai
Solved!
Go to Solution.
Attachments:
Screenie 1.jpg ‏92 KB
Screenie 2.jpg ‏96 KB
Screenie 3.jpg ‏93 KB

Pipes are point to point communication endpoints. That means you get undefined behaviour if you try to read the same pipe from multiple locations. In fact already the opening of a pipe for the same direction more than once might fail although it seems to work here (at least in screenie2), but if it wouldn't fail the Read that happens first will see the data that was sent and the rest won't see anything. You should definitely try to disable the ENTIRE Read pipe handling in your first VI in order to allow for the second VI to have any chances of working.
Error 42 is the LabVIEW error "generic error" used by the shared library when an error occurred that it doesn't specifically recognize. So that is not so helpfull when one can't go into the shared library itself to see what Windows API error happened.
Error code 8 is the LabVIEW errro code "file not found". The code tries to detect if a pipe with the name does already exist and if so it tries to connect to it. This could fail if the path to the pipe was invalid or if the pipe was opened with higher privileges than what you currently have or if it was opened by the other process for that direction already. This will generailly result in the error 8.
The OpenG Pipe library is indeed not a fully stable product. And it interfaces to a Windows part that is somewhat unknown and not so often used, and Microsoft is continously changing small parts of its implementation so that the library may indeed stumble over subtle changes in Windows over the time. Principially there shouldn't be any reason that it couldn't work in even Windows 8 since Pipes are a mechanisme that is used by many Windows components quite extensively it's just a little known feature for non-Microsoft applications and its semantics (details of operation) look a bit weird to the casual programmer. It originally (Windows NT) was trying to mimic the Posix standard but having been always different enough to what the normal Unix way of how pipes work is.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Hi everyone,
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Hi Albert,
Can you try to use the SQL Server Management Studio on server ‘SQL-IDA’ to connect to the instance on server ‘SQL-IDB’ to see if it works or not?
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b) name resolution to the server name is not correct, "ping -a yourserver" would tell if that's the case
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For more information:
Named Pipes Provider, error: 40 - Could not open a connection to SQL Server (Microsoft SQL Server, Error: XXX).
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Re: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server

Hi,
I'm encountering an issue with "Named Pipes Provider, error: 40 windows" and am having problems determining how to fix it due to the environment I'm using. I have two SQL Servers installed on two separate Win2K3 Server boxes, one is SQL Server 2000 and the other is SQL Server 2005. The SQL Server 2000 contains the actual application data. The 2005 database is used only for Reporting Services. I've set up the reports on SSRS such that their datasources hit the 2000 server. This is using SQL Server authentication.
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Named Pipes Provider, error: 40 - Could not open a connection to SQL Server :
I. Incorrect connection string, such as using SqlExpress.
Check out: http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=558456&SiteID=17
https://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1245564&SiteID=1
The typical error when dealing with Express includes:
a. User is not aware of SqlExpress was installed as a named instance, consequently, in his/her connection string, he/she only specify ".","localhost" etc instead of ".\SqlExpress" or "<machinename>\Sqlexpress".
b. Np was disabld by default after installing SqlExpress.
c. If Sqlexpress was installed on the remote box, you need to enable remote connection for Express.
Please read the following blog for best practice of connecting to SqlExpress.
http://blogs.msdn.com/sql_protocols/archive/2006/03/23/558651.aspx
II. Named Pipes(NP) was not enabled on the SQL instance.
Check out: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=136253&SiteID=1
Oppose to SQL 2000 which turn on all protocols, SQL 2005 SKUs turn off NP by default. So, when you see this error, please check:
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5) If you are using MDAC ODBC/OLEDB({SQL Server} or SQLOLEDB) provider, in command line, launch "cliconfg.exe" and make sure NP enabled and right pipe name specified.
III. Remote connection was not enabled.
Check out: when you right click on the Server in SQL Server Management Studio, in Connections, the Remote server connections part, you have enabled the "Allow remote connections to this server" check box
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=322792&SiteID=1
https://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=763875&SiteID=1
If you are making a remote connection, namely, your target SQL Server is on the different box as client application, you might need to check whether:
a. "File and Printer Sharing" was opened in Firewall exception list.
b. Please see the blog for enabling remote connection for express and troubleshooting tips of remote connection.
http://blogs.msdn.com/sql_protocols/archive/2005/11/14/492616.aspx
http://blogs.msdn.com/sql_protocols/archive/2006/09/30/SQL-Server-2005-Remote-Connectivity-Issue-TroubleShooting.aspx
IV. Server not started, or point to not a real server in your connection string.
Check out: Open SQL Server Surface Area Configuration and ensure all the required services are started, Remote Connections are configured.
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=348662&SiteID=1
a. use "sc query mssqlserver" for default instance or "sc query mssql$<instancename>" to make sure SQL Server was started. Sometimes, reseason behind the broken of your client application w/ this error:40 might be SQL server restarted and failed, so, it'd better for you to double check.
b. User specified wrong server in their connection string, as described in the forum discussion, "MSSQLSERVER" is an invalid instance name. Remember, when you connect to default instance, <machinename> could be best representitive for the instance, when you connect to a named instance such as sqlexpress, you should specify <machinename>\<instancename> as data source in your connection string.
V. Other reasons such as incorrect security context.
Check out: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=192622&SiteID=1
Such error also occured during user operation such as moving database or db mirroring or cluster, any DB OP that might invovle different sql instances, namely, the destination database is located in another sql instance and user is not aware of the state of the destination. I recommend you first isolate whether this fail is during connection stage or data operation stage.
a. During data operation, you are normally asked to type in the destination server name whether it is default to "(local)" or another server "<remotemachinename>". So, remember the exact string that represent the target instance, then when the error repros, open command line, use "sqlcmd -S<representitive> -E" ,see what happens, if the connection fail, please follow up above I - IV troubleshooting lists. otherwise continue.
b. If you can make basic conection, but still face the error, then there must be something that server reject the connection or client close the connection for some reason.
VI. Please try basic connectivity tests between the two mahcines you are working on. One simple way to verifty connectivity is to use command line tools, such as osql.exe. For example, osql -E -Stcpervername\instancename. If it connects cross-machine successfully, please also verify that your connection string in your scenario is correct.
Here are some blogs which could be helpful: just follow the basic connectivity troubleshooting guidelines on the SQL Protocols blog, see:
SQL Server 2005 Connectivity Issue Troubleshoot - Part I
http://blogs.msdn.com/sql_protocols/archive/2005/10/22/483684.aspx
and
SQL Server 2005 Connectivity Issue Troubleshoot - Part II
http://blogs.msdn.com/sql_protocols/archive/2005/10/29/486861.aspx
Hope this helps.

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Hi,
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Message was edited by:
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Windows could not start the SQL Server Agent(SQLEXPRESS) Service on local computer.
As the others already wrote, with SQL Server Express in Version 2008 the "SQL Server Agent" will be installed, but it's not a Feature of the Express Edition and therefore you can't start & use it.
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Hi,
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Any Ideas on how I can get my load thread count back up when using pipes ?
Thanks

Hi,
According to http://www.mcse.ms/archive27-2006-1-2068094.html you can do the following (substitute your c# program for 'type load.dat'):
>
type load.dat|sqlldr control=load.ctl userid=user/password data=\"-\"
Alternative (for both , unix and windows)- infile syntax:
load data
infile "-"
into table...
Metalink note 191043.1 may be interesting for you as well.
Does the performance then improve?
Cheers,
Colin

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Hi,
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Please may I add that this is on a SQL Server 2008 R2 Enterprise edition patched to 10.50.1600.
Nah, that server is not patched at all, because 10.50.1600 is the RTM version. Find Service Pack 2 and install at the next maintenance window, after having performed tests according to your local policy.
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Named Pipes Provider, error: 40 on workgroup workstations

I am having issues with a vendor supplied application. It generates an error when run from workstations that are not part of an Active Directory domain. The error is “provider: Named Pipes Provider, error: 40 –
Could not open a connection to SQL Server)”. It runs as expected when ran from a workstation that is a member of the domain. Obviously adding the workstation to the domain is a solution. However, because of concern of what might break this is not our preferred
solution.
The database is SQL Server 2008 on a 2008R2 system that is a member server of a domain. The systems that are having the error are workgroup systems running Windows 7. Except for the final step, I have pretty much
eliminated the other possibilities in Steps to troubleshoot SQL connectivity issues.
That, and the fact that the application successfully runs from a workstation that is a member of the domain lead me to believe it is an account/authentication issue on the workstation.
From what I have determined SQL authentication is required in this scenario and I have confirmed that the database server is configured for Windows and SQL Server authentication. I have also examined
the configuration file the application uses. It contains the user name and password for the account. Are these credentials not used to establish a connection?
The only thing I can think of, which I haven’t tested because 1) it is a production system and 2) it is a vendor supplied application, is the application needs to be run under a local workstation
account with the same credentials as the SQL Server account.
Could this be the case or is there something else I should be look at?
Thanks in advance.

Thanks for your response. I had posted a reply earlier but for some reason it doesn't appear to have uploaded.
The server name in the connection string is ntsrv12.xxx.yyy.edu. I am able to ping that name and ntsrv12 as well from workstations where the application fails.
I have some information from some additional testing I have done. Using my workstation, which is a domain member, I can successfully run the application when logged on with my domain user account.
However, if I logon with a local account the application fails with the error described above.
I have also been able to match Audit Failures in the SQL Server event log with failed attempts to run the application. There is a two error sequence that appears several times for 15 seconds until the application times out and displays the error message.
I have listed the errors below but certainly the application appears to see the server. Any ideas on what to check next?
Thank you.
The first error in the sequence is this:
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:
5/6/2014 1:50:05 PM
Event ID:      4776
Task Category: Credential Validation
Level:         Information
Keywords:      Audit Failure
User:
N/A
Computer:      Ntsrv12.xxx.yyy.edu
Description:
The computer attempted to validate the credentials for an account.
Authentication Package:
MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon Account: <MyLocalAccount>
Source Workstation:
<LocalSystemName>
Error Code:
0xc0000064
This error is followed by this one:
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:
5/6/2014 1:50:05 PM
Event ID:      4625
Task Category: Logon
Level:         Information
Keywords:      Audit Failure
User:
N/A
Computer:      Ntsrv12.xxx.yyy.edu
Description:
An account failed to log on.
Subject:
Security ID:
NULL SID
Account Name:
Account Domain:
Logon ID:
0x0
Logon Type:
3
Account For Which Logon Failed:
Security ID:
NULL SID
Account Name:
<MyLocalAccount>
Account Domain:
<LocalSystemName>
Failure Information:
Failure Reason:
Unknown user name or bad password.
Status:
0xc000006d
Sub Status:
0xc0000064
Process Information:
Caller Process ID:
0x0
Caller Process Name:     -
Network Information:
Workstation Name:        <LocalSystemName>
Source Network Address:
10.1.36.70
Source Port:
50145
Detailed Authentication Information:
Logon Process:
NtLmSsp
Authentication Package:
NTLM
Transited Services:
Package Name (NTLM only):
Key Length:
0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.

Named pipes Windows (OpenG implementation)

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