Topic: SSL_connect fail
When we use Wolfssl for FTPS, we find that the second socket connection fails. When the client sends client Hello, the server simply replies with an ACK. The current test found that this server and VSFTP will have this phenomenon, other servers (such as Filezilla) can be successful. We also tested MBED SSL, which was successfully connected. Do you have friends who have encountered similar problems?
The attachment is the simulated FTPS code under Linux, and the address of the server is test rebex. net:990（18.104.22.168:990）.
gcc c.c -o C -lwolfssl ./C 22.214.171.124 990