I'm running Ubuntu 18.04 although couldn't I get it to work with Ubuntu 16.04 either. I'm running apache 2.4.29 and openssl 1.1.0g.
I'm trying to setup a reverse proxy that worked with Ubuntu 14, and getting these errors:
Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /testserver. Reason: Error reading from remote server Apache/2.4.29 (Ubuntu) Server at 172.16.0.140 Port 443 From the log [Tue May 29 09:14:36.494710 2018] [ssl:info] [pid 23700:tid 139947205977856] SSL Library Error: error:1408F10B:SSL routines:ssl3_get_record:wrong version number when trying to connect via a browser also getting these errors from the command line on the backend openssl s_client -connect 1804-testserver.local:443 CONNECTED(00000003)139763485823424:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:252: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 5 bytes and written 176 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated SSL-Session: Protocol : TLSv1.2 Cipher : 0000 Session-ID: Session-ID-ctx: Master-Key: PSK identity: None PSK identity hint: None SRP username: None Start Time: 1527795715 Timeout : 7200 (sec) Verify return code: 0 (ok) Extended master secret: no ---