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Issue peer closed connection in SSL handshake

Azurel

Azurel

Silver Pleskian
Since set SSL I get often this errors in proxy_error.log

[error] 21204#0: *118653 peer closed connection in SSL handshake (104: Connection reset by peer) while SSL handshaking to upstream, client: xxxx

CentOS Linux 7.3.1611 (Core)‬
Product Plesk Onyx Version 17.0.17 Update #18
Server version: Apache/2.4.6 (CentOS) built: Nov 14 2016 18:04:44

What can I do to fix this?
 
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