As mentioned by updater, creating this thread.
I have Flash application which creates "Adobe Secure[ssl] socket " connection to Web server [ Nginx - TCP mode ].
But the request got dropped without any error message in webserver logs.
this problem didn't happen on previous chrome version 55.
Even other sites that running with Godaddy/Comodo certificates are working fine on Chrome 56 version. Only the problem for RapidSSL with Chrome 56 version [ Particularly for Secure socket connection not to HTTPS ].
Summaries : the RapidSSL site's HTTPS connection is working fine on the Chrome56. But Secure(SSL) socket connection that trigger from flash doesn't work. its aborted/dropped without any error message.
Note :
RapidSSL :
--> Chrome56 : HTTPS working
--> Chrome56 : Secure Socket [Flash] not working
--> Other browsers : All are working [ both HTTPS & Secure socket ]