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Named Pipes

I use a named pipe server to communicate from a printer port monitor to the user. This works fine when the pipe server and client are on the same PC. When I try to use this across a network the following code

hPipe=CreateFile(lpPipeName,GENERIC_READ|GENERIC_WRITE,0,NULL,
OPEN_EXISTING,0,NULL);

returns Error 5 'Access denied'

The same pipe server is running on all PCs. The only difference is the inclusion of the server name or IP address in the pipe name.

LPSTR lpPipeName="\\\\.\\pipe\\TestPipe" for the local machine is OK

LPSTR lpPipeName="\\\\192.168.1.25\\pipe\\TestPipe" fails (unless ip is ip of the local machine)

OSs are a mixture of Windows 7 and XP

Programming in C++

I guess it is a security problem but I can't find any useful info on this.

Peter

Meir Rivkin

try disable UAC in the remote machine, see if it solves he problem.

truromeo4juliet

Make sure a password isn't required to access the printer's host-computer's resources (such as the printer itself) unless you've included a function to automatically input any required network username/password combination ...

PeterC_UK

ASKER

Thanks but...

Same issue with XP so not UAC

Client PC (which is running named pipe server) can print to the network printer on the server. It is named pipe from server back to PC that receives Access Denied. The server can access resources on client PC without a problem.

Peter

digitap

What version of OS is the server?

ASKER CERTIFIED SOLUTION

Adam Brown

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David

Had somewhat similar thing happen with security problems, found if I just copied the executable into the \windows\system32 directory, it worked. Never looked into the specifics of why, but it did solve the problem.

PeterC_UK

ASKER

Hi diqitap

Currently testing on peer to peer - mix of windws 7 and XP

Peter

PeterC_UK

ASKER

Many thanks, All solved. This had been a nagging issue for some time and then became urgent