Captive portal redirect to a FQDN instead of the XG interface IP (for matching HTTPS commercial certificate)

Question

I am unable to find a way to set the correct FQDN for redirecting any unknown user to the captive portal. XG will redirect by default to the specific subnet interface IP. I only found the URL to redirect the user AFTER the login to the portal. 
 Redirecting to the crude IP will always mismatch the HTTPS certificate 
 I hope I am just missing some option... 
 
 Thanks

ce_Sophos · Accepted Answer

Guys, I found a workaround for this. It's working for me. My box XG450 (SFOS 17.0.5 MR-5) Navigate to Authentication > Services > Web Policy Actions for Unauthenticated Users (Captive Portal) Change "Login prompt method" to "Display a custom message" In the textbox enter below text Click Apply That's it enjoy. Ensure you have a valid HTTPS certificate uploaded to the UTM. Above method is working for me.

HuberChristian · Answer

Unfortunatedly, you do not miss anything. This is not possible so far. There is a feature Request open for this: 
 http://ideas.sophos.com/forums/330219-sophos-xg-firewall/suggestions/11580213-captive-portal-fqdn-support

lferrara · Answer

They removed the Captive Portal link on v16.5 (fortunately) and thanks for that but we hope in v17 they will add the FQDN feature. 
 Let's see if sachingurung or Aditya Patel have some ETA for it.

Michael Dunn · Answer

In 7.1, after you turn the option on the following hyperlinks will use hostname: Login to this network (Captive Portal) Access the User Portal Register for internet access Proceed (on the Warn page) 
 This will not change and will still use IP: NTLM authentication (because it happens in HTTP so there is no cert issue) 
 I do not know the timeline for 7.1, my guess is that it will be released April/May but please do not take that as any sort of commitment.

StefanoColombo · Answer

Unfortunately they did not fix it even on v17 , I just tried . 
 It's just amazing for me :-(