To resolve the issue you can change your SSL VPN configuration from a “Routed VPN” to a “Bridge VPN”, the routed VPN uses a virtual IP address pool (192.168.113.0/24) which does not match your internal IP range or the address range of the internal DNS Servers.
When a Windows client connects to the “Routed VPN” it appears that due to the DNS server mismatch they are not utilised by the client.
After that, the wizard should resume the installation process. Specifying the IP address range of a scope requires some knowledge of subnetting.DHCP has now been successfully installed and we are ready to configure it. Currently, the DHCP MMC looks empty and the server node in the left pane has a red arrow pointing down. Each scope in a DHCP server holds a pool of IP addresses to give out to clients, and the range of IP addresses must be within the allowed range of the subnet (that you specify on the subnet mask field). For the Start IP address , enter 192.168.0.240 and for the End IP address enter 192.168.0.254 , click Add , and then click Next.Our server now has a static IP address and we are now ready to install the DHCP server service. If this happens, insert your Windows Server 2003 CD into the server's CD-ROM drive and browse to the i386 directory. For the scope Name , enter “ Building A, Floor 1 .” For the scope Description , enter “ This scope is for Floor 1 of Building A .” Afterwards, click Next . For the Start IP address enter 192.168.0.1, for the End IP address enter 192.168.0.254 .The wizard should automatically find the file and allow you to select it. The scope name can be anything, but we certainly want to name it something that describes the scope's purpose. It is there in case we needed to provide a broader description of the scope. Finally, specify a subnet mask of 255.255.255.0 and click Next.While our articles make use of specific IP addresses and network settings, you can change these settings as needed to make them compatible with your LAN – This won't require you to make changes to your LAN, but you'll need to have a slightly stronger understanding of DHCP and TCP/IP.
Before we install the DHCP server service on Windows Server 2003, we need to assign the Windows server a static IP address. Go to Start Network Connections , right-click Local Area Connection and choose Properties . When the Local Area Connection Properties window comes up, select Internet Protocol (TCP/IP) and click the Properties button. When the Internet Protocol (TCP/IP) window comes up, enter an IP address , subnet mask and default gateway IP address that is compatible with your LAN.In those cases, you have to exclude the IP addresses from being assigned out by DHCP. The lease duration is how long clients should keep their IP addresses before having to renew them. If a short lease duration is configured, clients will be renewing their IP addresses more frequently.We have the opportunity here to define those IP addresses that are to be excluded. The result will be additional network traffic and additional strain on the DHCP server.The same configuration can be applied to a standalone server even though the step-by-step details differ slightly.The upcoming 'Advanced DHCP Server Configuration on Windows 2003' article will discuss other DHCP options and features such as superscopes, multicast scopes, dynamic DNS, DHCP Backup and more.We specified IP addresses 192.168.0.240 to 192.168.0.254 to ensure we've included our servers plus a few spare IP addresses for future use. On the other hand if a long lease duration is configured, IP addresses previously obtained by decommissioned clients would remain leased and unavailable to future clients until the leases either expire or are manually deleted.