Watchguard Firebox X1000 Reference Manual page 90

CHAPTER 5: Common Log Messages
78
rbcast[] Error sending data on optional--will not use
anymore: Network is unreachable
The RBCAST service is unable to send broadcasts on the optional
interface. Possible causes include:
- Nothing connected to the interface
- Improper or no rule regarding the traffic
The RBCAST service sends directed broadcasts on UDP ports to
other networks. An Outgoing service rule must be associated with
it.
received an unencrypted packet when crypto active
This message can be safely ignored. It indicates that an
unencrypted packet, (normally a connection notification that has
no data and no bearing on the actual connection), has been
received.
Request blocked by WebBlocker (proxy access blocked)
This generally indicates that some browser on the network is
trying to connect to an http proxy server. WebBlocker interprets
this as an attempt to bypass its protections and denies the attempt.
smtp-proxy[]: [x.x.x.x:35105 x.x.x.x:25] Bad command:
XXXXXX"
The client attempted a non-standard SMTP command not
recognized by the SMTP Proxy.
smtp-proxy[630]: [x.x.x.x:11323 x.x.x.x:25] proxy connect
failed (Connection timed out)
Indicates that the proxy was unable to connect to a mail server.
The Proxy Connect Timeout defines the amount of time (in
seconds) that the proxies will wait before giving up trying to
forward a connection to an unreachable or non-responsive host.
After a connection is established, the standard proxy timeout
values apply. The default value for Proxy Connect Timeout is 10
seconds. If you have trouble reaching sites through the proxy that
normally require more than 10 seconds before a connection can be
acknowledged (such as systems over slow links in distant parts of
the world, or heavily loaded servers), you can try raising this
value by adding (or editing) the following property in the
configuration file:
WatchGuard Firebox System