Chapter 23 PPTP VPN
SBG3500-N Series User’s Guide
297
TIP: This could be due to one of the following reasons:
a. The client device is not connected to the Internet successfully.
Action: Check the client device’s Internet connection.
b. Incorrect server address configured on the client device.
(1) If the Local WAN Interface is “Any”:
From the SBG3500-N Series’s GUI, click Status. The client device should be configured
with one of the WAN interface IP addresses.
(2) If the Local WAN Interface is an interface (IP address shown to the right):
Use that IP address for the client device to connect.
c. The WAN interface which the SBG3500-N Series’s PPTP VPN is using is not connected.
Action: From the SBG3500-N Series’s GUI, click Status. Check if the WAN interface the client
device is connected has an IP address present.
d. The PPTP VPN is not enabled.
Action: From the SBG3500-N Series’s GUI, click VPN > PPTP VPN. Check Enable checkbox and
click Apply.
e. PPTP is not configured correctly on the client device.
Action: Refer to Section 4.14 on page 69 for an example of PPTP VPN.
f. The client entered an incorrect username or password.
Action: From the SBG3500-N Series’s GUI, click Maintenance > User Account. The client should
use one of the accounts to make the connection.
g. The SBG3500-N Series has already reached the maximum number of concurrent PPTP VPN
connections.
Action: There are too many clients connected. Wait a while and then retry.
2 A PPTP client is disconnected unexpectedly.
Tip: A PPTP connection will be dropped when one of the followings occurs on the SBG3500-N
Series:
a. The client has no activity for a period of time.
b. The client loses connectivity to the SBG3500-N Series for a period of time.
c. PPTP VPN is disabled on the SBG3500-N Series.
d. When any one of these configuration changes is applied on the SBG3500-N Series: WAN
interface used for PPTP VPN, IP address pool, access group.
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