Hi, quick heads-up to anybody building/using stunnel 5.50 on Solaris 10 and wondering where the "Invalid configuration file name" errors are coming from: The problem is the call to realpath in line 334 of options.c, it uses NULL as second argument as a request to have the realpath function allocate the memory buffer for the sanitized string.

This variant of realpath is not supported on Solaris 10, and leads to EINVAL (error code 22).

Quickest fix is to run configure and then manually change src/config.h to have /* #undef HAVE_REALPATH */ instead of #define HAVE_REALPATH 1