OAM - Apache Server - WebGate - https failing back to http instead of https

If you encounter this issue , you will have set the correct secure HTTP headers

If it is not possible to make modifications to the reverse proxy then it is possible to configure OAM to pass the required SSL headers as well.  To ensure that the WebGate checks SSL on a reverse proxy server do the following:

1. Go to Access System Console -> Access System Configuration -> Access Gate configuration and modify the accessgate.
   
2. Add a ProxySSLHeaderVar entry to the "User Defined Parameters" section at the bottom of the form. The value of the proxySSLHeaderVar parameter defines the name of the header variable the proxy must set. The value of the header variable must be "ssl" or "nonssl". For example:
   
   ProxySSLHeaderVar:IS_SSL
   
3. In the loadbalancer, add an HTTP custom header variable that contains the name specified above and set its value to “ssl”.