XP Machines not communicating to SEPM 14 via HTTPS

Hello.
I do as specified in TECH236004 :
Installed 12.1 legacy client on a computer with Windows XP, and TLS 1.0 is enabled in Internet Options (TECH231025)

But agent SEP does not connect to SEPM. Error "<ParseErrorCode:>12029=>The attempt to connect to the server failed.".
If use http communication settings (8014 port), connection is established successfully.
Telnet on SEPM:443 port passes successfully.