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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
---
  • Welcome to Ask Ubuntu! Could you please add a little more detail? What exactly did you do, what did you expect to happen and what happened instead? Did you encounter any warning or error messages? Please reproduce them in their entirety in your question. You can select, copy and paste terminal content and most dialogue messages in Ubuntu. Please edit your post to add information instead of posting a comment. (see How do I ask a good question?) – David Foerster Jun 5 '18 at 11:46

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