SSL VPN - Cannot access most of the remote devices

Question

Hello, 
 I just installed a SG115 at a customer site. 
 External (Internet) access and redirections (DNAT) are working fine. 
 
 I also configured a SSL VPN (as usual, as described in https://community.sophos.com/kb/en-us/116038 ). 
 The VPN connection is established without any problem, I receive an address in the VPN range (10.242.2.0/24). 
 But... most of the devices in the remote network (192.168.75.0/24) cannot be reached (ping, http, https...) 
 There are (in the remote network) some very basic devices, managed via a basic (without specific security) HTTP interface but they cannot be reached. 
 But some other can : I can connect to 192.168.75.207 but I cannot connect to 192.168.75.3 (both have a basic HTTP interface). 
 Another Sophos UTM (192.168.75.2) can be reached via https on port 4444. 
 Same problem with ping : 192.168.75.207 can be ping, but 192.168.75.3 not. 
 Same issue with network discovery : about 1 device out of 4 can be discovered, other not. 
 
 Do you have any idea about the problem ? 
 thanks in advance for your help.

Steve Weißflog · Accepted Answer

I think internal (Windows) firewalls or Endpoint Firewalls are blocking connections from 10.242.2.0-net? Try with disabled internal firewalls (or config a rule for access from 10.242.2.0-net). 
 You can also config a SNAT on UTM (SSL-Pool -> Any -> Internal Network ->change Source to internal(adress)) this will avoid any internal firewall trouble... 
 
 regards