As you can see pretty standard testing of the library, since im new to it.

int main() {
    modbus_t* ctx;

    ctx = modbus_new_tcp("127.0.0.1", 502);
    if (ctx == nullptr) {
        std::cerr << "Failed to create the Modbus context." << std::endl;
        return -1;
    }

    // Enable debugging to get detailed output
    modbus_set_debug(ctx, TRUE);

    // Connect to the Modbus server
    if (modbus_connect(ctx) == -1) {
        // Print the error message using modbus_strerror
        std::cerr << "Connection failed: " << modbus_strerror(errno) << std::endl;

        // Use GetLastError() for additional Windows-specific error details
        DWORD dwError = GetLastError();
        std::cerr << "Windows error code: " << dwError << std::endl;

        modbus_free(ctx);
        return -1;
    }  
} 

The output is as follows:
Connecting to 127.0.0.1:502
Connection failed: No error
Windows error code: 0

D:ProjectesProjectes_Visual_Studiolibmodbus_testlibmodbus_testReleaselibmodbus_test.exe (process 2928) exited with code -1 (0xffffffff).
Port is not in use and I don’t have the firewall blocking anything.
Any help could be appreciated my OS is Win32

Why is not giving a error code but failing regardless?