Can't select own deprecated VPN IPSEC policies

Question

Hello. 
 After upgrading to 17 MR1 (and again on MR2 and 3) my IPSEC connections to an old router (Zyxel SBG3300) are not working anymore! 
 Sophos is in "respond olny" but the issue is that, if I edit the IPSec policy I made to connect to the Zyxel years ago, it shows me that some parameters are "not reccomended because they are not secure". 
 The editor gives me the possibility to use them, and I can correctly save the policy but, when I want to use that policy in an IPSec connection, the polcy doesn't appear in the dropdown menu! 
 I need that policy, I know thay are not so secure, but I need it and I want it to be usable again in an IPSec connection. 
 Thanks, Mat

sachingurung · Answer

Hi Mattia, 
 Can you please provide me more information about the configured policy and the IPSec mode configured? Note that, an Aggressive mode with PSK (Authentication Type) is not supported for security reasons ; hence, if you have configured a policy with Authentication Mode as Aggressive then you cannot see the Policy using PSK for Authentication Type . 
 Hope that helps.

Steve Tuinstra · Answer

I found that if I disable dead peer detection, the policy becomes selectable when setting up the ipsec.