Description of problem:
After upgrading from httpd-2.4.29-1.fc27.x86_64 to latest httpd-2.4.33-2.fc27.x86_64

reverse proxy has stopped working and I get error logs

[Wed Apr 11 23:20:23.596423 2018] [core:notice] [pid 7:tid 140093022845184] AH00094: Command line: 'httpd -d /etc/httpd/ -e info -D FOREGROUND'
[Wed Apr 11 23:20:28.215140 2018] [proxy:error] [pid 12:tid 140092236625664] AH00961: HTTPS: failed to enable ssl support for 172.23.0.3:8443 (dogtag-10-5-6.dogtag-nw)
[Wed Apr 11 23:20:28.546692 2018] [proxy:error] [pid 12:tid 140092323849984] AH00961: HTTPS: failed to enable ssl support for 172.23.0.3:8443 (dogtag-10-5-6.dogtag-nw)

virtual host configuration:
<VirtualHost *:443>
ServerName dogtag2.bit.space
NSSEngine on
<Proxy *>
Require all granted
</Proxy>
NSSProxyEngine on
NSSNickname dogtag2.bit.space
<Location / >
ProxyPass https://dogtag-10-5-6.dogtag-nw:8443/
ProxyPassReverse https://dogtag-10-5-6.dogtag-nw:8443/
</Location>
</VirtualHost>

Version-Release number of selected component (if applicable):
2.4.33-2

How reproducible:
100%

Steps to Reproduce:
1. Install version 2.4.29
2. Install mod_nss
3. Create and save certificate/key in nssdb
4. Configure reverse proxy
5. Test to see that everything works
6. Upgrade to 2.4.33
7. Boom. No reverse proxy and error messages in log.

Actual results:
HTTP 500 Internal Server Error

Expected results:
Working reverse proxy to internal https site.

Additional info:
After opening an bug-report https://bugzilla.redhat.com/show_bug.cgi?id=1566511 we concluded that an interface has been broken in 2.4.33 and -multiproxy patch needs updating.