Remote Access via IPSec, Client connected but not receiving packets, not resolved

Question

The Problem was first described here : Remote Access via IPSec, Client connected but not receiving packets 
 Currently running Version 9.713-19 of the Sophos UTM 9 SG550 Firewall. 
 Client IPSec version is the latest available : 2.2.75 
 NAT-Traversal Keep Alive has since been changed to 10 seconds. 
 Once the Client is connected via the VPN it can ping the Firewall successfully. 
 Network Protection rules must be fine since other users have no Problems whatsoever. 
 We also use L2TP over IPSec as VPN and that stopped working as of late aswell. 
 The VPN on Sophos is simply not reliable, some users can't connect on either of the VPN solutions and I have wasted so much time already looking for solutions.

Amodin · Answer

MikR said: In regards to IP Pools. What I have noticed is that clients who have the issue with 0 bytes received on the IPSec Client have usually received the very first IP Address from the virtual Pool. (x.x.x.1) 
 That was the other issue with the IP addresses that I had found. Part of this would require you to change your pool a little bit so they aren't receiving that as part of the range of IPs to pick from. It's not a problem with not having enough, it has to do with the range. 
 This is the post I read related to this: L2TP not passing traffic - VPN: Site to Site and Remote Access - UTM Firewall - Sophos Community

Remote Access via IPSec, Client connected but not receiving packets, not resolved

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