Issue with my Sophos XG Firewall

Question

Hi to all Sophos Specialists, 
 
 I would like to ask help from this community. I have around 160 plus SSL users connected to our SOPHOS XG 310 firewall. But there are around 20 users cannot connect. I already checked everything, reinstalled the SSL VPN Client. I also tried to reset their passwords. Still they cannot connect. Can anyone here shed some light on what is going on. My theory, correct me if I am wrong the SOPHOS has already reached its limits in connecting the maximum number of users. Below is a screenshot. 
 
 Any help will be greatly appreciated. 
 
 Thanks

Hardik_R · Answer

Hi Rodney Altamera 
 The default IPv4 lease range is set to lease 50 IP addresses for SSL VPN so as per your response problem seems to be the lease range. 
 If 50 IP addresses are already leased then 51th user will not get IP address and you would see auth-failure at SSL VPN client log. 
 Refer below screenshot for default lease range.