ZyXEL Communications SBG3300-N series User Manual page 229

b. The access group is not configured correctly. From the Device's GUI, go to VPN > PPTP VPN >
Setup to check. Note that all local hosts are by default accessible unless access group is
configured.
c. IP Address Pool for PPTP VPN conflicts with any WAN, LAN, DMZ, WLAN, or L2TP VPN subnet
configured on the Device. Note that the IP Address Pool for PPTP VPN has a 24-bit netmask and
should not conflict with any others listed above even if they are not in use.
A PPTP client is connected successfully but cannot browse the Internet.
4
Tip: From the Device's GUI, click VPN > PPTP VPN > Setup. Check if DNS Server is configured.
A client cannot browse the Internet without DNS resolved. Note that when a new DNS server is
configured, the client must disconnect then reconnect in order for the new DNS Server to take
effect.
An Android device cannot connect to the Device's PPTP VPN.
5
Tip: Devices running an Android OS older than version 4.1 have issues with PPTP/MPPE encryption.
Avoid using devices that run an Android OS older than version 4.1 for PPTP VPN connection.
SBG3300-N Series User's Guide
Chapter 20 PPTP VPN
229