Total Connections Failed

[stevebrockleank]

Hi,

I'm currently seeing the counters for the 'Total Connections Failed' statistic increasing by a large amount.

What I can't see is why. The serverfarms we have don't see to show any drops.

Using ANM 5.1 we also see this under 'Monitor' 'Load Balancing' 'Statistics'

Can anyone help me troubleshoot the reason for this?

These commands were run about 10 seconds apart

sho stats connection

+------------------------------------------+
+------- Connection statistics ------------+
+------------------------------------------+
Total Connections Created  : 3263852
Total Connections Current  : 19307
Total Connections Destroyed: 746611
Total Connections Timed-out: 1071592
Total Connections Failed   : 1443733

sho stats connection

+------------------------------------------+
+------- Connection statistics ------------+
+------------------------------------------+
Total Connections Created  : 3290607
Total Connections Current  : 19266
Total Connections Destroyed: 751995
Total Connections Timed-out: 1079222
Total Connections Failed   : 1457515

I'm running an ACE20 on A2(3.5)

Thanks

[Cesar Roque]

Hi Steve,

Total number of connection attempts that failed to establish a connection to the real server.

For Layer 4 traffic with normalization on, the count increments if the three-way handshake fails to be established for either of the following

reasons:

. A RST comes from the client or the server after a SYN-ACK.

. The server does not reply to a SYN. The connection times out.

For Layer 4 traffic with normalization off, the count does not increment.

For L7 traffic (normalization is always on), the count increments if the three-way handshake fails to be established for either of the following

reasons:

.   A RST comes from the server after the front-end connection is established

.   The server does not reply to a SYN. The connection times out.

There general counter references a number of things, it could be also a route lookup failure, we could see it from "show np 1 me-stats -socm":

Drop [route lookup fail]

One of the reasons that this could increment is if the ACE receives any traffic it does not know how to route in which case it will be dropped.

---------------------
Cesar R
ANS Team

[stevebrockleank]

Thanks Cesar, I'll have a deeper look at the ACE and config to see if I can see any of the possible things you have mentioned.