remote users connetced by SD-RED 20 do not get ip from windows DHCP

Question

Hello 
 we have SG115 UTM in our network and remote location connected to us by SD-RED 20 device. 
 we have internal windows DHCP server for assigning ip to users but remote location users can not get ip from our windows DHCP server and we have to use SG115 DHCP service to assign ip to remote users. 
 can anyone help me? 
 thanks

Raphael Alganes · Answer

Hi Babak, 
 Good day and thanks for reaching out to Sophos Community 
 May you check if you've followed steps on this doc guide: https://docs.sophos.com/nsg/sophos-utm/utm/9.708/help/en-us/Content/utm/utmAdminGuide/utmOnly/NetworkServicesDHCPRelay.htm 
 Then if yes, you may begin troubleshooting DHCP relay using this KB: https://support.sophos.com/support/s/article/KB-000040396?language=en_US 
 Thanks for your time and patience and thank you for choosing Sophos 
 Cheers,