SAN HQ Critical Alert - impossible to get logs from PS4100X

Hello.

I have a Dell Equallogic SAN PS4100X v7.0.10 and a SAN HQ server in release 3.0.2.7457.

Yesterday I receive an email which talking about error 14.2

Caution conditions:

• 7/28/2016 5:17:09 PM
  
  • [ID: 14.2] Unable to establish connection.
  • The SAN HQ server issued SNMP requests at the group, some or all of which failed.  This condition is likely due to network congestion or failed network connectivity.  The server will retry within 60 seconds.  Check your network connectivity and check that the storage group is online.  If the problem persists, contact your Dell support provider for assistance.

If I run SAN HQ Client I can observe a 14.1 Critical Alert: Unexpected Exception in Service. SAN HQ seems to be connected but there is no logs.

I try to upgrade to 3.2.0.8291 but this is the same issue. Nothing change on our side, and I test a snmpwalk with same community, it's working.

Have you ideas ?

Thanks