Probe DNS

Question

Dear
I have a probe DNS , but by someone reason, in spite that the service DNS is up, the probe show that down. I tried putting domain and expect, but the results are the same. The process is the next:
a) First time detect service up.
b) Service is down, the probe detect the fail.Rserver is down.
c) The service is put up. But the probe never detect the service up.
See the next picture:
ACE4710-1/IIS# show probe DNS detail
probe : DNS
type : DNS
state : ACTIVE
description : "test de DNS"
port : 53 address : 0.0.0.0 addr type : -
interval : 30 pass intvl : 300 pass count : 3
fail count: 3 recv timeout: 10
dns domain : www.cisco.com
--------------------- probe results --------------------
probe association probed-address probes failed passed health
------------------- ---------------+----------+----------+----------+-------
rserver : DNS1-G
10.1.5.20 17 5 12 FAILED
Socket state : CLOSED
No. Passed states : 1 No. Failed states : 1
No. Probes skipped : 0 Last status code : 0
No. Out of Sockets : 0 No. Internal error: 0
Last disconnect err : Connection refused by server
Last probe time : Wed Feb 11 20:17:12 2009
Last fail time : Wed Feb 11 20:16:42 2009
Last active time : Wed Feb 11 19:57:12 2009
rserver : DNS1-N
10.1.5.12 29 5 24 FAILED
Socket state : CLOSED
No. Passed states : 0 No. Failed states : 1
No. Probes skipped : 0 Last status code : 0
No. Out of Sockets : 0 No. Internal error: 0
Last disconnect err : Connection refused by server
Last probe time : Wed Feb 11 20:21:17 2009
Last fail time : Wed Feb 11 20:20:47 2009
Last active time : Tue Feb 10 22:03:17 2009
admin dns DNS
DOMAIN WWW.CISCO.COM
expect 198.133.219.25
Best Regards

Answer 1

It does response to your pc, but not to ACE.
Or the response never makes it to ACE.
Either because of routing issue.
Or because it is dropped by an ACL.
Could even be an ACL on ACE itself.
Again, a sniffer trace to confirm that the response makes it to ACE.
G.