Cosmic verification
Confirming the bug with the distro packages:
 *** 2.4.34-1ubuntu2.1 500
        500 http://br.archive.ubuntu.com/ubuntu cosmic-updates/main amd64 
Packages


index is downloaded, but after a long delay:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem 
--cert client-auth.pem --key client-auth.key --tlsv1.2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10918  100 10918    0     0    705      0  0:00:15  0:00:15 --:--:--  2567

access log confirms the client certificate was used:
10.0.100.50 - - [05/Jul/2019:13:40:32 +0000] "GET / HTTP/1.1" 200 16544 "-" 
"curl/7.61.0" protocol=TLSv1.2 commonName=client-auth

Updating apache and repeating the download:
 *** 2.4.34-1ubuntu2.2 500
        500 http://br.archive.ubuntu.com/ubuntu cosmic-proposed/main amd64 
Packages

Now it's fast:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem 
--cert client-auth.pem --key client-auth.key --tlsv1.2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10918  100 10918    0     0  1332k      0 --:--:-- --:--:-- --:--:-- 1332k

Log confirms client certificate authentication is still being used:
10.0.100.50 - - [05/Jul/2019:13:58:13 +0000] "GET / HTTP/1.1" 200 16525 "-" 
"curl/7.61.0" protocol=TLSv1.2 commonName=client-auth

The slight difference in downloaded data (16544 vs 16525) is due to less tls 
keep-alive pings in the success case. The md5 of index.html is identical:
# md5sum index.html*
3526531ccd6c6a1d2340574a305a18f8  index.html
3526531ccd6c6a1d2340574a305a18f8  index.html-before

Cosmic verification succeeded.


** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic

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You received this bug notification because you are a member of Ubuntu
Server, which is subscribed to apache2 in Ubuntu.
https://bugs.launchpad.net/bugs/1833039

Title:
  18.04/Apache2: rejecting client initiated renegotiation due to openssl
  1.1.1

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