Access to cable modem not working any more

Question

Hi together, 
 since MR3 (I hope this is correct) I cannot access my management interface of my cable modem anymore: 
 The modem is in bridge mode in order to get the WAN IP with DHCP directly on my XG. 
 Additionally the modem's web interface is accessible over 192.168.100.1 on my WAN port. This was working in the past and stopped after MR3 or so. 
 Now the browser is loading for a long time and displays a Sophos error page "Website not available" with reason "We found the website's address but were unable to connect to the web server." afterwards. A telnet on port 80 directly in the advanced shell of the XG isn't working as well. 
 I cannot get any information from the log viewer and PCAP about this issue. A FW rule on top without any protection doesn't help either. 
 Thanks and best regards 
 Dom Nik

Dom Nik · Answer

Hi all, 
 I have solved the problem with the help of Casual_User's post in this thread: https://community.sophos.com/products/xg-firewall/f/network-and-routing/99751/what-is-my-modems-ip 
 "It will likely be on a different subnet. To access it from your network you'll need to add an alias for your WAN port that is the same subnet as your modem. You can do that here: Configure -> Interfaces -> Add Interface -> Add Alias "select the external WAN port"" 
 So basically Ina gave the right answer but I didn't know how to do it. :-) 
 My modem has the IP 192.168.100.1, so the alias must be on the WAN port with IP/netmask, e.g. 192.168.100.10/24 . 
 Best Regards 
 Dom Nik