|Cables||Check all network cables to be sure you don't have a bad cable.|
|Bypass the firewall|
If you're using network address translation (NAT), you might be blocked by a
firewall. Temporarily bypass the firewall by connecting a laptop to the
appliance on the physical interface using a cable, and then verify network
If this type of connection is impractical, try placing your laptop on the same
network segment as the external interface of the appliance (to get as close to
the appliance as possible).
|Configure the switch port|
If you experience network latency, such as slow SCP file copying or slow
performance by the Web proxy or network tunnel service, the problem may
be due to configuration differences between the appliance interface settings
and the switch ports to which the appliance is connected. It’s possible for a
switch to improperly detect duplex-mode settings (for example, the appliance
is configured at full duplex but the switch detects half duplex). Cisco has
documented such problems with its switches.
To resolve this problem, disable auto negotiation. Instead, configure the
switch port to statically assign settings that match the appliance. You must
check both switch ports and both appliance interface settings (internal and
external, if applicable). If even one interface/switch port is mismatched,
If you are experiencing network latency but your appliance/switch ports are
configured correctly, the problem lies somewhere else in the network. It
could also be an application-level issue (such as slow name resolution on the
DNS server being accessed by the Web proxy or network tunnel service).