- Plesk for Linux
A website is not working via HTTPS with the following error in a browser:
PLESK_INFO: example.com uses an unsupported protocol.
CloudFlare is serving DNS for this website.
The "openssl" utility shows the following:
# openssl s_client -connect example.com:443
140492318349128:error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure:s23_clnt.c:744:
no peer certificate available
No client certificate CA names sent
SSL handshake has read 7 bytes and written 247 bytes
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
CloudFlare service is not configured properly.
A domain is configured to use network preferences of Content Delivery Network (CDN) service which is misconfigured.
Contact CloudFlare support for troubleshooting.
If CDN service is used for a domain, check SSL settings on CDN server side.