SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP3)
After you installed new GW18 WebAccess, all services are running but you cannot get to initial login screen when hitting WebAccess URL from a browser.
You will notice that your request "http://<ip or DNS>/gw " gets automatically redirected into "https://<ip or DNS>/gw/webacc".
On a WebAccess host go into /etc/apache2/conf.d. There will be a new file "rewrite.conf" which redirects a communication to secured HTTPS protocol. Open this file and leave there only the very first line:
Save changes and restart apache2 web server.
This file is not present in any upgraded SP2 -> SP3 SLES12 hosts.
If you do not use rewrite option on your apache configuration, then you can completely rename this file.
Also note, that WebAccess is in GW18 started via own apache-tomcat combo, new "rcgrpwise-tomcat" startup option. Therefore, you will indeed need to run also configuration part of WebAccess since the configuration has been changed.