Good Evening, The first problem, ERROR_SUCCESS was my fault, adding debug statements to check the other issues, which corrupted the error state. I still have the other two problems, related with ERROR_GEN_FAILURE and ERROR_INSUFFICIENT_BUFFER. Any suggestions are welcome. Best regards Mariano Gentile On 03/09/2018 11:46 AM, Mariano Gentile wrote: > Good Morning, > > In the last days we were facing some errors in Windows 10, > connected with the TAP driver, taken from the OpenVPN web site > (we tested both versions, but normally we use the newest one > tap-windows-9.21.2.exe). > > We faced three types of error. > > The first one I suppose it is just a simple mistake, since we see the > error message: > "Failed to read the TAP device: The operation completed successfully." > Reading the code of "tun-win32.c" file, the "os_read_tun()" function > returns an error > if the "ReadFile()" function returns FALSE, but I suppose > in that case it is not really an error, since the reported error is > ERROR_SUCCESS. > Even if the Microsoft documentation says that "ReadFile()" should return > TRUE, > I think we could easily catch this special error and just go on, do you > agree? > > The second and third errors that we are facing are a bit more difficult > to understand: > ?Failed to read from TAP device: A device attached to the system is not > functioning.? -> ERROR_GEN_FAILURE > "Failed to write the TAP device. The data area passed to a system call > is too small" -> ERROR_INSUFFICIENT_BUFFER > respectively from the function "ReadFile()" and "WriteFile()", both in > the tun-win32.c file. > I saw the last commits of OpenConnect and that part of code did not > changed recently. > I was trying to understand what is going wrong, but reading the > Microsoft documentation, > it seems that the two functions are indeed called in a proper way, so I > have no clue at the moment. > > I would be glad to find a solution and help fixing this problem, but I > am out of ideas. > Do you have some hint about what could be wrong? > > Thanks > Best regards > Mariano Gentile > -- Mariano Gentile Tel.: +49 (0)89 1241 373 - 0 eMail: mag at schaeuffelhut-berger.de Sch?uffelhut Berger GmbH M?nchner Stra?e 10, 82008 Unterhaching Unternehmenssitz: Unterhaching Handelsregister beim Amtsgericht M?nchen Handelsregister-Nummer: HRB 205010 Gesch?ftsf?hrer: Matthias Berger Friedrich Sch?uffelhut
