WAF HTTPS returning HTTP

Hi,

I have a strange problem with the Web Application Firewall.
I want to connect to my webmail using HTTPS when I'm outside the society and with HTTP when I'm at the office. Actually my webmail work perfectly at the office using HTTP.

I have configure my Asataro to access my webmail using HTTPS when I'm outside but I have this strange issue :

- I enter my external webmail address (for exemple https://webmail.society.com).
- My webmail ask me who I'm (normal).
- After authentification I get this message from "http://webmail.society.com//mail/mybase.nsf?OpenDatabase" :

- If I replace the address in address bar by "https://webmail.society.com//mail/mybase.nsf?OpenDatabase", I can access to my webmail.

Do you know what is wrong ?

My webmail is Domino 8.53 (iNotes) and my Astaro is in 8.103.

Thanks for your help.