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
