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User’s Guide
ICMP Destination Host Access Denied
Counter
ICMP Destination Host Access Denied events are counted in the ICMP All Errors
and the ICMP Destination Unreachable counters. A count of all destination
unreachable ICMP symptoms and a count of all ICMP errors displays in the
Overview counters of Expert View. A threshold can be set in Expert Alarms for all
destination unreachable ICMP errors or for all ICMP errors.
Expert Symptom
ICMP Destination Host Access Denied events are automatically logged as expert
symptoms. The
Symptom Summary field provides information about the IP
addresses involved. For example:
[206.250.228.69] cannot be reached by [206.250.228.11].
SA=[206.250.228.11] DA=[206.250.228.69]
Diagnostic Details
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Problem Description:
An ICMP Destination Host Administratively Prohibited message has been sent.
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Probable Cause(s):
1. If a router has a routing table problem, it may send this message.
2. A host may send this message if the destination host does not have proper access.
3. The source may have an incorrectly configured subnet mask.
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Recommended Action(s):
1. Check the routing tables of the router that this message was generated from.
2. Check the netmask configuration of the source and/or the router.
3. Ignore this message if the host is truly prohibited (no action required).