ZyXEL Communications SBG3500-N000 User Manual page 279

A PPTP client is connected successfully but cannot access the local host or server behind the
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SBG3500-N.
Tip: This may be caused by one of the followings:
a. The local host or server is disconnected.
b. The access group is not configured correctly. From the SBG3500-N'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 SBG3500-N. 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.
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Tip: From the SBG3500-N'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 SBG3500-N's PPTP VPN.
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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.
SBG3500-N000 User's Guide
Chapter 21 PPTP VPN
279