web admin certificate error

Question

My UTM 9.7.5 crashed so i decided to build an XG firewall. Everything is working perfectly, except for 1 thing. Whenever i want to logon on to the web admin console Firefox refuses to load the page and chromium browsers (Brave/Edge) show warnings. 
 
 I have searched the community pages but most articles seem to be related to HTTPS Decrypt and inspect. 
 I hope that there is a simple solution, thnak you for any help. Much appreciated. 
 PPG

LuCar Toni · Accepted Answer

Hi, simply because most likely your Browser do not trust the CA Certificate of XG Firewall. 
 https://community.sophos.com/kb/en-us/127287 
 https://community.sophos.com/kb/en-us/132678 
 
 Personal speaking, i recommend to use the DDNS by Sophos and create a new self signed certificate for this host name. 
 Then use this DDNS with Port 4444 to access XG.