ACE : Connection failures counter

Question

Hi,
In the command show serverfarm :
CH01AC03/P-115-A# sh serverfarm NCL_FARM_PROD
serverfarm : NCL_FARM_PROD, type: HOST
total rservers : 6
----------connections-----------
real weight state current total failures
---+---------------------+------+------------+----------+----------+---------
rserver: HQBUUN203
10.56.7.209:443 8 OPERATIONAL 16 130388 15
rserver: HQBUUN205
10.56.7.210:443 8 OPERATIONAL 10 130392 10
rserver: HQBUUN221
10.56.7.94:443 8 OPERATIONAL 9 130383 19
rserver: HQBUUN222
10.56.7.93:443 8 OPERATIONAL 7 130391 12
rserver: HQVEUN218
10.56.7.96:443 8 OPERATIONAL 13 130390 13
rserver: HQVEUN219
10.56.7.95:443 8 OPERATIONAL 9 130389 14
What does the connections failures field mean ? Is it the number of time the ACE did not receive a SYN-ACK packet within a time window after having sent a SYN ? If it is true, what is the timeout value and can I modify it ?
Thank you
Yves Haemmerli

Answer 1

Yves,
the timeout is the embryonic timeout and it can be configured within a parameter-map.
Other reason for this counter to increment is if the rserver responds with a RST.
We have also seen bugs where the client sending a RST results in this counter to increment.
If you can, verify with a sniffer trace in what condition you are before changing the embryonic timeout.
Gilles.