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What's the significance of this error message on a Juniper NetScreen NS100?

Posted on 2007-12-05
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Last Modified: 2008-02-01
We've been receiving this error message for quite some time.  It doesn't appear to affect performance, although our site is running rather slowly today, which is when I happened to notice this error.  It reports as critical, although I've never received a notification from the device.  Does anyone have any ideas?  Thank you.
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Question by:jmg999
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4 Comments
 
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Expert Comment

by:MeCanHelp
ID: 20415106
You have configured "Server Auto Detection" in the VIP setting for this service. By doing so, the Netscreen attempts to contact that service every so often, and if they don't respond, it marks them as
"Down" and won't forward traffic to them. You can turn off the auto detection discretely to see which
service is complaining.
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Author Comment

by:jmg999
ID: 20417636
Thank you for your response.  My question would be, if these servers aren't responding when the service is on, how is traffic still getting to them?  All the servers are listed as being down, but traffic is still flowing to them.
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MeCanHelp earned 2000 total points
ID: 20418797
All that message means is that the heartbeat PING that is sent by the firewall is not being responded to from that virtual IP address. The only traffic associated with that message is simply the PING. Sort of like the Hello packet that Cisco routers send out to other routers to make sure they are still there. Just because a specific device is down doesn't mean that traffic that is normally sent to them is going to stop. Some devices like Cisco can autosense when devices are down and will adjust however not all devices act in that manner.
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Author Comment

by:jmg999
ID: 20424384
I see.  That makes much more sense.  Thank you for your expertise.
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