ZyXEL Communications ZyWALL USG 50 User Manual page 788

Chapter 52 Troubleshooting
• Make sure the To-ZyWALL firewall rules allow IPSec VPN traffic to the ZyWALL.
IKE uses UDP port 500, AH uses IP protocol 51, and ESP uses IP protocol 50.
• The ZyWALL supports UDP port 500 and UDP port 4500 for NAT traversal. If you
enable this, make sure the To-ZyWALL firewall rules allow UDP port 4500 too.
• Make sure regular firewall rules allow traffic between the VPN tunnel and the
rest of the network. Regular firewall rules check packets the ZyWALL sends
before the ZyWALL encrypts them and check packets the ZyWALL receives after
the ZyWALL decrypts them. This depends on the zone to which you assign the
VPN tunnel and the zone from which and to which traffic may be routed.
• If you set up a VPN tunnel across the Internet, make sure your ISP supports AH
or ESP (whichever you are using).
• If you have the ZyWALL and remote IPSec router use certificates to authenticate
each other, You must set up the certificates for the ZyWALL and remote IPSec
router first and make sure they trust each other's certificates. If the ZyWALL's
certificate is self-signed, import it into the remote IPsec router. If it is signed by
a CA, make sure the remote IPsec router trusts that CA. The ZyWALL uses one
of its Trusted Certificates to authenticate the remote IPSec router's
certificate. The trusted certificate can be the remote IPSec router's self-signed
certificate or that of a trusted CA that signed the remote IPSec router's
certificate.
• Multiple SAs connecting through a secure gateway must have the same
negotiation mode.
The VPN connection is up but VPN traffic cannot be transmitted through the VPN
tunnel.
If you have the Configuration > VPN > IPSec VPN > VPN Connection
screen's Use Policy Route to control dynamic IPSec rules option enabled,
check the routing policies to see if they are sending traffic elsewhere instead of
through the VPN tunnels.
I uploaded a logo to show in the SSL VPN user screens but it does not display
properly.
The logo graphic must be GIF, JPG, or PNG format. The graphic should use a
resolution of 127 x 57 pixels to avoid distortion when displayed. The ZyWALL
automatically resizes a graphic of a different resolution to 127 x 57 pixels. The file
size must be 100 kilobytes or less. Transparent background is recommended.
I logged into the SSL VPN but cannot see some of the resource links.
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ZyWALL USG 50 User's Guide