SP memcache plugin problem

[Daniele Russo]

Hi, we have two load-balanced node with SP 2.5.3, memcache 1.4.17 and
libmemcached 1.0.18.
When one of memcache server is down, login fails and we receive error:
Memcache::getMemcache Problems: CONNECTION FAILURE and then error:
Memcache::getMemcache Problems: SERVER HAS FAILED AND IS DISABLED UNTIL
TIMED RETRY.

This is the StorageService configuration:
    <!-- This set of components stores sessions and other persistent data
in MEMCACHE. -->
    <StorageService type="MEMCACHE" id="mc" prefix="SERVICE_PREFIX:">
      <Hosts>
        172.22.0.2:11211, 172.22.0.9:11211
      </Hosts>
    </StorageService>

    <StorageService type="MEMCACHE" id="mc-ctx" prefix="SERVICE_PREFIX:"
buildMap="1">
      <Hosts>
        172.22.0.2:11211, 172.22.0.9:11211
      </Hosts>
    </StorageService>

    <SessionCache type="StorageService" cacheTimeout="28000"
StorageService="mc-ctx" StorageServiceLite="mc" />
    <ReplayCache StorageService="mc"/>
    <ArtifactMap StorageService="mc" artifactTTL="180"/>

Where we wrong?
We have another SP (4 nodes) with SP 2.5.0-2.1 that doesn't present this
problem.

Thanks

Daniele
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