ACE : Rserver connection failures ?

[yves.haemmerli]

Hi,

In a productive environment, I observe rserver counters and I can read several connection failures. However, the site seems to work correctly.

What are the conditions under which he ACE increments the connection failures counter ?

Here is an extract of the show serverfarm command :

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       12     OPERATIONAL  11         2363414    334
   rserver: HQBUUN205
       10.56.7.210:443       12     OPERATIONAL  11         2321347    2055
   rserver: HQBUUN221
       10.56.7.94:443        8      OPERATIONAL  10         1611561    1270
   rserver: HQBUUN222
       10.56.7.93:443        8      OPERATIONAL  20         1608550    189
   rserver: HQVEUN218
       10.56.7.96:443        8      OPERATIONAL  15         1532865    1307
   rserver: HQVEUN219
       10.56.7.95:443        8      OPERATIONAL  12         1607162    304

Thank you for any hints

Yves Haemmerli

[Gilles Dufour]

Yves,

normally only RST from the rserver or no response to SYN from the rserver are counted as failure.

However, we had issues with this as identified in  CSCtd22008 "ACE- Client RST in End-to-End SSL generates Rserver conn-failures."

An old one is CSCsh14278 "sh serverfarm failure conn incremented for successful connection".

So, if you want to be sure, the only option is to capture a sniffer trace.

Gilles.