The following messages are generated by APM upon analyzing diagnostics test results for a network path. They describe issues detected.

Message ID Message
Excessive latency measured Advanced Analysis “Excessive latency measured”
Excessive packet rtt Advanced Analysis “Excessive packet round-trip time (RTT) detected”
High utilization detected Advanced Analysis “High utilization detected”
Rate-limiting detected Advanced Analysis “Rate-limiting behavior detected”
Maximum transmission unit Maximum Transmission Unit
Message 1 ICMP connectivity error messages received
Message 10 Responder agent in use
Message 1001 Capacity constriction <capacity measure> detected between hop <number> and hop <number>
Message 1002 Black hole detected between hop and target
Message 1003 Congestion detected between hop <number> and target
Message 1004 Duplex conflict detected between hop <number> and target
Message 1005 Excessive latency detected at target
Message 1006 Gray-hole detected between hop <number> and target
Message 1007 Excessively long media used for half duplex causing <percent> loss detected between hop <number> and hop <number>
Message 1008 High utilization <percent> detected at target
Message 1009 Intermittent connectivity causing <percent> loss detected between hop <number> and target
Message 1010 IP QoS value alteration started at hop <number>
Message 1011 Limited performance due to use of half duplex or mixture of half- and full-duplex modes detected between hop <number> and target
Message 1012 Limited performance due to misconfigured NIC cards or drivers detected between hop <number> and target
Message 1013 Limited performance may be due to a mid-path device or a slow-path response at target
Message 1014 Limiting mechanism detected between hop <number> and target
Message 1015 Media errors causing <percent> loss detected between hop <number> and target
Message 1016 MTU constriction <measured MTU> detected at hop <number>
Message 1017 Other possible diagnoses present - see <view> details
Message 1018 Packet loss <percent> originating at hop <number>
Message 1019 Path MTU discovery is not supported at target
Message 1020 MOS value of <MOS value> measured to target <address>, due to <percent> loss
Message 1021 Poorly performing link due to half-duplex constriction detected between hop <number> and target
Message 1022 QoS mechanism may be compromised on network path
Message 1023 Routing loop causing <percent> loss detected between hop <number> and target
Message 1024 Small packet congestion detected between hop <number> and target
Message 1025 Specified VoIP call load is excessive for network path
Message 1026 Largest latency in path detected between hop <number> and hop <number>
Message 1027 White hole detected between hop and target
Message 1028 MTU is too large to reliably detect network problems
Message 1029 Limited performance may be due to a slow-path response at target
Message 1030 Packet reordering <percent> detected at target <address>
Message 1031 Limited performance due to VLAN tagging (802.1p QoS) mismatch detected between hop <number> and target
Message 1033 IP QoS value alteration detected at target <address>
Message 1034 Source monitoring point appears to be behind a firewall
Message 11 Excessive latency measured
Message 12 Excessive packet round-trip time (RTT) detected
Message 13 Device does not respond suitably to test packets
Message 14 Traceroute failed to complete
Message 154 Some measurements are unavailable at this hop
Message 16 Inconsistent network path detected”
Message 17 Network path does not properly support PMTU discovery
Message 18 Packet loss detected
Message 19 Insufficient statistics to generate all measurements”
Message 2 ICMP error response messages received
Message 21 ICMP TTL Expired message received”
Message 22 ICMP Fragmentation Needed And DF Set message received
Message 23 Total capacity does not correspond to any known standard
Message 24 CPU-limited response - total capacity depressed
Message 25 Total capacity corresponds to an Ethernet standard
Message 26 Total capacity corresponds to a non-Ethernet standard
Message 27 Inconsistent handling of voice packets detected”
Message 28 High utilization detected
Message 3 ICMP router messages received
Message 30 Measured MTU is too large for reliable packet error detection
Message 31 Sub-optimal MOS indicates presence of user-detectable voice degradation
Message 32 IP QoS value was altered in packets
Message 33 Congestion causing packet loss detected
Message 34 Rate-limiting behavior detected
Message 35 Half/Full-duplex conflict detected
Message 36 Full/Half-duplex conflict detected
Message 37 MTU conflict detected
Message 39 Media errors detected
Message 4 ICMP ECHO REPLY packets received that were not solicited
Message 40 Black-hole hop detected - MTU conflicts possible
Message 41 Gray-hole hop detected - MTU conflicts possible
Message 42 Path MTU constriction point detected
Message 43 Path congestion point detected
Message 44 Root cause of target host condition detected
Message 45 Longest link on network path detected
Message 46 Path capacity constriction point detected
Message 47 Inconsistent behaviors observed at this hop - response does not reflect end-to-end performance
Message 5 Packet reordering detected
Message 51 Routing loop in network path detected
Message 52 ICMP limiting by a device in the network path detected
Message 54 White-hole hop detected - performance degradation due to fragmentation possible
Message 55 Half-duplex collision domain violation detected
Message 56 Sub-optimal performance detected
Message 59 Specified voice call load is excessive for this path
Message 6 Detected MTU is a known standard
Message 60 QoS mechanism may be compromised
Message 61 Poorly performing link impacting time-sensitive traffic detected
Message 62 Small packet congestion detected
Message 63 Limiting detected at target
Message 64 Intermittent connectivity loss detected during testing
Message 7 Detected MTU is nonstandard
Message 8 Detected MTU is a common jumbo frame size
Message 9 IP address for this hop appears more than once in network path
Mixing TCP and legacy Mixing TCP and Legacy Protocols
Poorly performing hops Poorly Performing Routers/Switches/NICs
The apparent network The apparent network
Packet reordering Understanding reordered packets
Why duplex conflicts occur Why duplex conflicts occur